SOURCE: Engine misfire, EGR replaced still rough idle!
First, check the passageway to the egr valve to make sure it is clear (often plugs up with carbon) second, make sure that the egr control is working. Also a good idea to have any codes checked and old ones cleared.Computer may need to cycle a few times to "learn"new parameters.
In general, it is good to shut down your engine when check engine light comes on...The next step after that is to determine why the light came on.
If the cause is an oil related or coolant related item, you should drive no further 'till it's corrected...However, there are numerous sensors that can turn it on with no disasterous results if you continue to drive One example is the light coming on because a gas cap has not been put on correctly...On many vehicles this will turn on the light and set a code, but the car will suffer no damage if you drove to your destination before correcting it.So, if the light comes on and it is not overheating and you have good oil pressure, and you hear no noises from engine, have it looked at but don't put yourself in danger on the side of a major highway for a nonsense code.
Most major parts houses will read codes free...take advantage of that service and get yourself a basic repair manual, so you have an idea what all the stuff under your hood is and does.
Good luck with your car!!
SOURCE: 96 tahoe idles rough skipping smooths out on the road code PO300
how long has it been doing it,if all very recent, then could be simple as bad gas,water plays very ruff in gas
SOURCE: 2003 tahoe idles rough and stalls
might want to check your mast air flow sensor. if your check eng. light is on have the codes downloaded
SOURCE: 95 Chevy C-1500 runs rough at idle and during accelleration
Check the vacuum line to the fuel pressure regulator and check to see if the fuel pressure regulator has gone bad. Give the throttle body a good cleaning and the injectors too. Do not use carb cleaner, it's to corrosive for the gaskets used in the throttle body. The other thing too that would cause this is a stuck or bad EGR valve, Try cleaning the EGR valve too since your cleaning the throttle body. Good luck and keep me posted.
SOURCE: Rough idle
Your egr valve is stuck open tap on it with a small hammer to losen up the carbon build up.
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