Slight miss in motor..please help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jefe · 06-24-2002, 07:51 PM

I have a 68 Chevy, with a mild 350 in it. Just had heads machined and put together 1.94 & 1.50 stainless. New springs, new lifters, new aluminum intake, new points and condenser, plugs cap/rotor, new wires. When I am driving ( not all the time) but sometimes it will like "hiccup" it will actually miss real quik and return to normal, engine runs at about 190 degrees. I am thinking that it is a slight carb problem..(quadrajet). Checked the dwell and timing, both are perfect. New fuel pump too. Other than the miss every no and again, it runs really strong and smooth. Any ideas, anybody? Thanks again!

**COBALT** · 06-24-2002, 07:57 PM

What happens under hard acceleration, like from a dead stop to WOT?

Baradium · 06-24-2002, 07:58 PM

wiring maybe?

Jefe · 06-24-2002, 08:01 PM

The engine harness and light harness under the hood is all brand new same with spark plug wires. Under hard excelleration it seems to run fine, but misses every once and awhile.

jhow66 · 06-24-2002, 08:14 PM

Loose coil wires?--loose wire on coil?--loose ground wire inside dist.?--loose wire on ignition switch? Does it feel like you are turning the switch on and off?

Gordo · 06-24-2002, 08:25 PM

Even one spark plug going bad/fouling would do that.

**D.PASSMORE** · 06-24-2002, 08:29 PM

is the coil new ? i had one that when the coil heated up it died. replaced it and no more problems . 2 things that keep the engine running- gas and fire.

06-24-2002, 07:51 PM	#1
Jefe Registered User Join Date: Jul 2000 Location: Chandler, Arizona, USA Posts: 299	Slight miss in motor..please help. I have a 68 Chevy, with a mild 350 in it. Just had heads machined and put together 1.94 & 1.50 stainless. New springs, new lifters, new aluminum intake, new points and condenser, plugs cap/rotor, new wires. When I am driving ( not all the time) but sometimes it will like "hiccup" it will actually miss real quik and return to normal, engine runs at about 190 degrees. I am thinking that it is a slight carb problem..(quadrajet). Checked the dwell and timing, both are perfect. New fuel pump too. Other than the miss every no and again, it runs really strong and smooth. Any ideas, anybody? Thanks again!

06-24-2002, 07:57 PM	#2
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	What happens under hard acceleration, like from a dead stop to WOT? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

06-24-2002, 08:14 PM	#5
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	miss Loose coil wires?--loose wire on coil?--loose ground wire inside dist.?--loose wire on ignition switch? Does it feel like you are turning the switch on and off? Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

06-24-2002, 08:25 PM	#6
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Even one spark plug going bad/fouling would do that. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

06-24-2002, 08:29 PM	#7
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,059	is the coil new ? i had one that when the coil heated up it died. replaced it and no more problems . 2 things that keep the engine running- gas and fire. __________________ DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie)

06-24-2002, 07:58 PM	#3
Baradium Binder Rep Join Date: Jan 2001 Location: Salcha, AK Posts: 1,506	wiring maybe?

06-24-2002, 08:01 PM	#4
Jefe Registered User Join Date: Jul 2000 Location: Chandler, Arizona, USA Posts: 299	The engine harness and light harness under the hood is all brand new same with spark plug wires. Under hard excelleration it seems to run fine, but misses every once and awhile.



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