Very high Idle Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1986gmc · 08-29-2012, 10:31 AM

Ok so I have a 1986 gmc 1500 with a after market holley carb on in.I replaced my broken electric choke, changed the spark plugs,spark plug wires, and distributor rotor and cap. Now when I start the truck up it revs out at 4-5 thousand rpms. So now what I did right,spark plugs are all gapped right at.035,fireing order for wires is correct checked it several times, distributor should be fine I put it back on the same exact way it came off.I have the idle screw vertially all the way out think that would help it didnt, messed with themixture screws a little, but now have them set at default 3 turns out. I really dont know what could be causeing the problem, I was wondering if anyone had any ideas?

08-29-2012, 10:31 AM	#1
1986gmc Registered User Join Date: Aug 2012 Location: oak harbor,wa Posts: 10	Very high Idle Problems Ok so I have a 1986 gmc 1500 with a after market holley carb on in.I replaced my broken electric choke, changed the spark plugs,spark plug wires, and distributor rotor and cap. Now when I start the truck up it revs out at 4-5 thousand rpms. So now what I did right,spark plugs are all gapped right at.035,fireing order for wires is correct checked it several times, distributor should be fine I put it back on the same exact way it came off.I have the idle screw vertially all the way out think that would help it didnt, messed with themixture screws a little, but now have them set at default 3 turns out. I really dont know what could be causeing the problem, I was wondering if anyone had any ideas?

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