1983 g20 Chevy van rough idle

Noah-25
Thu, 03 Sep 2020 05:48:33 +0000
Maintenance/Repairs

Have a 1983 g20 I just bought, 104k original miles. Drove an hour home fine. Few days later filled up added some high mileage sea foam little less than 1/2 bottle.
10 minutes in. Engine is shaking and sputtering. Oil temp fluctuating.
Went to auto zone and grabbed new spark plugs and wires. No leak as far as I can tell oils and everything perfect.
Bought spark plugs and wires. Swapped them out. I noticed choke does not work and stays open. Wires are correct.
Did not use a torque wrench, tightened finger tight then until snug.
Took the van around the block and highway and was fine. Yet an hour later idle is rough soon as I step on the gas, a look at the jets and both are fine, used carb cleaner.
Pickup isn’t amazing on freeway but is there, just at stops engine will shake and die. Didn’t mess with idle screw or anything of that matter. Wasn’t sure if I need to grab a new coil or something else entirely.
Looked like the spark plugs where never changed, oils are all changed.
Bad gas? Something stuck in the carb?
When pulled off the dog house I noticed remnants of a rat yet would assume if anything was wrong that initial drive over an hour I would have known?
Any help greatly appreciated do not have the money to spend at mechanic at home doing it myself.
After new plugs and wires the oil gauge is at the first line and idles rough till dies, lights dim etc until I press the pedal. New battery.
Alternator? Coil? Carb? At wits end

5 posts - 3 participants