1994 Suburban...lacking power and the tach is showing a bounce like it is missing. Under load it noticeably skips and shudders. I replaced the cap/rotor, fuel filter, air filter, and plugs....still happening. any help would be appreciated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
My guess would be the transmission bands are slipping. This would cause what you describe. First check the transmission fluid and make sure it is full. Check it according to the instructions in your owners manual. If you only had an issue with the tach I would suspect a loose ground wire, but considering the transmission is acting up you more than likely have a transition issue that is just being reflected in the tach.
COULD BE GROUND PROBLEMS OR THE TACH GOING BAD.EVEN THOUGH CAR SEEMS TO BE RUNNING GOOD IDLING GOOD.SOME TIMES A SPARK PLUG MISFIRE.CAUSING A LITTLE ROUGH IDLING CAUSING TACH NEEDLE TO GO CRAZY.I SEEN ALTERNATOR WITH VOLTAGE REGULATOR GOING BAD CAUSE A POWER SURGE CAUSING HEAD LIGHTS TO DIM A LITTLE THEN BRIGHT WHILE ENGINE IDLING.THIS WILL CAUSE TACH METER NEEDLE BOUNCE AROUND ALSO.
if your o2 sensor is reading too lean then you have a vacume leak spray brake cleaner on all your vacume hoses one at a time if nothing then spray it around your intake manifold gasket they are usually the culprit