1994 Pontiac Bonneville Rough idle

GFAMI45

MEMBER
1994 PONTIAC BONNEVILLE
6 CYL
FWD
AUTOMATIC
118,000 MILES

My bonni has been running fine then it stated running rough. At a stoplight the engine will rough idle and car will vibrate. Definate loss in power just not smooth like it use to be. I've changed plugs, plug wires, fuel filter, and recenly had intake manifold changed due to hydrolock. Even checked the vacume hoses and they look fine? I'm stumped and not sure if I wanna put any more money into this car. Wife loves this cars cushiness and I hate to let her go if its a fairly reasonable fix.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check the idle air control valve and the EGR valve

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Wednesday, June 10th, 2009 AT 10:48 AM

GFAMI45

MEMBER
2 POSTS

Went back to mechanic today and he probed and noid tested fuel injectors. Saw one injector was not working he said bad connection at connector so he said buy new connector which I did and no help. But I think he's on the right track. Injectors should be replaced @ 50,000 if thats true and my resistance readings of 17 on front off engine and 14 ohms on the back side could be saying bad injectors. And I notice a big vibration intermitantly on acceleration. Feels like injector turns on the floods the car or just the opposite it turns off and drags the engine down.