jeff37110

Basically my car has a miss at idle and acts like it has lost some power in upper rpms.. I put new msd coils on,ngk plugs,fuel pump,bbk pressure regulator,fuel filter,cold air intake. I cant really figure this one out..Sometimes it sounds like a have a vacumn leak but cant find it anywhere.. Any suggestions?????Thanks in advance!!

jmsjags

that's probly what it is a vacuum leak or an exhaust leak or something like that. my car had a hole in one of the rubber hoses connecting to my intake and it did some weird things. the car would stutter at stoplights and sometimes it felt like it was gonna cut off on me. i fixed that and haven't had any problems since. hope u get everything worked out!

Brute03

a vac leak could be the possible culprit. is your CEL on? how many miles do you have? based on what you've already changed, my guess would be a dirty MAF or aging o2 sensors

massred98gt

did all this start happening before or after you changed the coils or coil packs(assuming u have a pre 99 stang), fuel regulator, etc. If so then its something you did. i bought some msd coil packs for my car and my car ran like absolute crap until i put the stock one back on. couldn't find the problem either PITA. or like stated before it could be a vacuum leak. spray come carb cleaner around the engine to see if it effects the idle at all. if it does u got urself a vacuum leak

Frostbitten

did you really put all that stuff on at the same time??

jagass

Whoa...It sucks...

jeff37110

It was missing before I put coils and all the stuff on. The weird thing is no CEL. I havent had the car long and was eventually going to upgrade to the stuff I bought anyway. I will try the carb cleaner and check for vacumn leaks. If I cant figure it out, I will take to a garage. I have spent alot of money just guessing at common sense things. Thanks for all advice guys.