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Rough idle 1995 chevy p/up 305cid v-8, rough idle in park and drive at 10 mph, seems to disappear over 20 mph, did tune-up; wires, cap & rotor, plugs, fuel filter, air filter; no change; thoroughly cleaned throttle body & flapper; no change; maybe a vaccuum problem???? I'm having the exact problem on my 1995 Chevrolet Tahoe
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Of the cuff, I would suspect bad gas. It sounds as if the truck has been seldom driven, and may need a gas additive to "revive" the stale gas.
Some people would put about 10 gallons of "premium" gas in it to see if that would help.
God bless your efforts.
Does the truck seem fine when you first start it & then acts up when it reaches operating temp?
That would lead me to look at my oxygen sensor, a bad sensor can cause the truck to run "rich" which would explain the fuel smell in the exhaust.
I actually had to replace my EGR valve and the gasket. I clean the valve well and reused both. I don't think the gasket sealed well enough though. So I went ahead and got a new valve, gasket and changed them. It runs a lot smoother now.
it may just need a good tune up, also check the hose from the air filter to the engine, if it has a crack or hole in it then it will be sucking to much air and will cause the engine to labor
5 years ago for cap & rotor???? It sounds like it's in dire need of a complete tune up - plugs. wires, cap, rotor, all fluids & filters ESPECIALLY fuel filter. I'd start there and run a good fuel system cleaner through it. Do your tune ups more frequently like every 30K - not wait 5 years!
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Thank you.
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