Hello people on monday I had a new Exhaust Manifold put on my 02 SS by a local shop went to drive off the car started jerking pretty bad wouldn't even go into 2nd. Made a u-turn back to the shop guy says that I need a Ignition coil they put that on the car then take it for a drive around the block then they say I need new plugs & wires and a fuel filter. On my way to work today starts acting an *** going up a hill the car wouldn't switch into gears right then the check engine light started blinking but wouldn't stay on. Then on a flat straight shot when I mash on the gas it wouldn't change gears it would rev up to 4,000 RPM's then I would have to let of the gas a little for it get to back down to 2,000 RPM's then it would switch gears ok but once I put it on cruise control on the highway its fine for a bit them bam it will jump all the way up to 4,000 again ! Has anybody out there had this problem ?

 

i had the same thing happen in my truck my 99 ram 1500. went to go on the highway and sarted to get up there and truck start chuggin not switchin gears let off gas ran fine put on gas eninge light flashed and flashed at me took it in the shop found out it was a fuel pressure regulator and got it replaced problem was fixed maybe the same? not sure just sounds like what i wen tthru in my truck

 

Thank u back to the shop I go in the morning ! MPG went down from 25 to 16.5 !

 

most times thats one of the common issues with the regulator that and stalling and such no problem. hope it helps, hopefully thats right, nice car by the way. signin off for the night

 

Thanks take it easy !

 

It is your catalytic converter. I just had the same symptoms and it acted the same as yours. The rest of the stuff they did was a waste of money.

 

here's a link ." https://montecarloforum.com/forum/engine-transmission-12/3-8l-questions-29004/ "

 

CAT for sure

 

First, I'm curious why did the exhaust manifold need replaced (or was it just the gasket for the manifold)? The stock manifolds don't really go bad from what I've seen.

My guess would be a potential bad CAT (agreeing with a coupld others that have chimmed in). Sounds like it's not flowing exhaust out like it should and sometimes it does.

BUT, before dumping ANY money on it, you mentioned the check engine light flashed on. This means an internal diagnostic failed on the car and the computer has some data stored regarding what happened. From what I've seen, most cheap ODB-II scanner read current and history codes. I found messing with a Snap-On Scanner is can read current and history codes BUT can read other code storages on the car, such as last code thrown, last code thrown since last cleared, and codes thrown during this ignition cycle. Bottom line, the light flashed, there's a code stored in there. Retrieve it and share what was found, it may further confirm the problem as a CAT or point you in a different (and hopefully correct) direction.

 

come to think off it i did also have the cat cut off on my truck at the same time i had to replace the fuel pressure regulator so that could also be the problem as well.