The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Truck running poorly under load, need help.

f.monroe · 08-25-2016, 07:23 PM

Sounds like a timing issue(they will always retard like stated above on their own ,never advance) or the spark plug wires,cap,or rotor are breaking down. I have had this happen in the past. Pulling up a hill or accelerating puts a higher demand on the ignition system. Pop the hood tonight and look at the plug wires while it's running. See if they are jumping fire anywhere.
Frank

08-25-2016, 07:23 PM	#16
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: Truck running poorly under load, need help. Sounds like a timing issue(they will always retard like stated above on their own ,never advance) or the spark plug wires,cap,or rotor are breaking down. I have had this happen in the past. Pulling up a hill or accelerating puts a higher demand on the ignition system. Pop the hood tonight and look at the plug wires while it's running. See if they are jumping fire anywhere. Frank __________________ Born and proudly residing in a Red State !