Check all of your tune-up parts. (Distributor Cap, Distributor Rotor, Spark Plugs and Spark Plug Wires) Also perform a compression test if no problem is found with the tune-up parts. Check also for vacuum leaks and the Intake Air Control Valve (IAC) for the "won't idle" problem.
SOURCE: 1995 Jimmy Rough Idle
w/o much more info it sounds like it needs a good tune up plugs wires fuel filter pcv vave throttle bore clean and injecter clean,try to do most of this your self it is costly
SOURCE: runs extremly rough at idle runs great at speed
have you checked the pcv valve. a vacuume leak will make your car idel rough too listen arround the throttle body and intake hose for a hiss use a piece of hose @ 2 feet long 1 end in ear other end prod arround to listen for a hissing sound if you hear one plug it up if idle gets better that hose or hole need to be connected to what ever it came off of.
SOURCE: how do you clean a throttle body on 1999 s70?
try this b4 taking things apart... redexe/wynns fuel additive and using high octane fuel the computer will adjust running accordingly...
SOURCE: The vehicle idles rough. Also had a few codes
Try cleaning TAC valve, spray throttle body cleaner in upper right of opening clean well.
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