Intermitant rough idling and vibrations and lacks power when climbing
You need a meter and test the coil 20 to 40 min after it has had power in it. but if its ruff idling and lacking power it could be the timing is out. or a bad plug lead or spark plugs. you not said what car it is. get your self a timing light. mark the timing marks on engine with white paint and plug the timing light into spark plug one and run engine the light should light up on the timing mark on the big end pulley. if not adjust the distributor till it lines up and then lock it off. also points in the distributor may need adjusting or replacing if there is not much left. and the cap as well you will prob find it is the points need changing.
SOURCE: 2000 Daewoo Lanos intermittently idles rough
check throttle body and pcv hoses and ports for blockage possible carbon build up and sticky iac valve
SOURCE: running rough
If your car is running rough and it's fuel injected (which yours is). Follow the air intake (black plastic box - housing the air filter that has tubing that goes to the motor) until it reaches the Throttle body (rounded metal air intake at the end of the plastic tube - has one large flap inside). You will want to remove the hose clamp and thoroughly clean the throttle body and the AIC (air idle control valve - small canister attached to the throttle body). Use off-the-shelf cleaner from any automotive store. This takes about 30mins to 1hr depending on your skill level. This will result in a cleaner smother idle and smoother performance. This is a common issue in today's cars. I have to do this once a yr to keep my modified car running happy.
Take a look at the later parts of this article for pictures to give you an idea:
http://forums.nicoclub.com/zerothread/319146
Good Luck
SOURCE: My 1994 Ford Ranger (2.3L, 2WD, Auto-trans) runs
I suggest to get the codes checked so you're not chasing a moving target. You'll need to look online - check out the Ranger/Explorer forums - or get the Factory Service Manual (FSM) to get the technical info you're requesting.
GL,
Td
SOURCE: My 2001 Escort, 70k runs
That mechanic wasn't lying. I currently own three of them and I know a lot of people that own them and they all have a rough idle. The engines are internally balanced and they don't have dampeners, so you get the engine vibration transferred to the car and that is what you are feeling.
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