Still having the same 'ol problem...?

Question

I have a 2002 Dodge Intrepid 2.7 ltr engine, Automatic trans, 245,000 miles here's what's wrong...

From stop~ If I take off normally it sputters & bucks when it switches gears, and does so until I let off the gas. However if I ease into it it gets to higher speed w no problem, and runs great. Anytime I 'floor' the gas pedal it bucks, when I ease off and ease into it its good.... NOW at cruising speed when I 'floor' it as to pass someone, it BOGGS DOWN, (and not quite backfires but almost) at this point when I take my foot completely off the gas I feel a jerk & notice the tack revs high for a moment then goes into normal range. So far I changed the MAP sensor- and both shift sensors... HELP... I dont mind spending a few bucks to fix the problem on my own, but dont wanna go to a pro & get ripped off either, I know the car is old (mileage wise) but its in great shape, and runs grea until now...and I bet its something real simple... ANY IDEAS?

Answer 1

sounds like the timing belt i would take it to a shop for 50 bucks and have them tell you what is wrong cheaper than changing part after part if it is backfiring you r having valve or timing related issues

Answer 2

The 1st 3 guys have all good points.

The Intrepid has a history of timing chain issues. I would get your timing checked, as well as inspect the chain, tensioners, etc.

Clean the injectors... you can pay a shop to take them out and clean them, or you can try using Chevron Techron concentrate in the fuel tank (or Red Line SI-1 or SI-2).

I'm not sure how to check the cat tho. It makes sense. When you demand some juice, you are trying to flow more air thru the entire system. I however think if your cat was clogged, it would set off the CEL... since you'd get a build-up of exhaust gases near the O2 sensor.

Answer 3

Has anything been done to the injectors? They may be firty, also the fuel filter? After all these miles, you must have changed the plugs too.

Answer 4

Cat covertor is plugged -