adanp

Is it possable to have a stoped up exhaust muffler?
Pls no smart asses im not a certified mechanic just need some help with my car.

bufmatmuslepants

iTrader: (3)

It's possible to have a clogged catalytic converter

adanp

No cats ,headers to pipe to exhaust muffler to dual cut offs

moehorsepower

iTrader: (3)

Explain in more detail and maybe we can help..Mods, stock?

adanp

Edelbrock headers welded to four inch id oval pipe to unknown brand exhaust muffler(cant find markings on it)

FAD2BLK93

What kind of problem are u having? Symtoms? Mods?

adanp

Ill run it as soon as i acelerate up it will almost pull back like a back fire, it slowly acelerates i have to really have the pedal all the way down

adanp

I also changed my plugs wires and optispark to so im stressing

FAD2BLK93

Is the motor miss firing at idle? U may have a plug wire arcing. Check it at night in the dark its pretty easy to see if it is arcing somewhere.

grazi

I had something similiar going on and a new MAP sensor cured it. If its not a 93 you can also unplug the MAF sensor to see if it runs different.

adanp

Maf was one of the first things i replaced ill try that thing in the dark where and what im i looking for the wires at plug ?

grazi

I noticed arcing on mine same method. It has to be super dark to notice though. Start it up and rev it. While revving, just look around and see if you see any flashing.

adanp

Well guys today i swaped the map sensor and still same symptoms.Any new ideas?

SS RRR

iTrader: (2)

Is there a certain RPM where you start losing power or does it start hesitating as soon as you try to accelerate? I know you said "like" a backfire, but has it backfired while doing this?

lt11994

Does it have an SES light on? Like posted above does it actually backfire? Does it do it 100% of the time or just when hot/cold? I had an accelerating backfiring problem and it turned out to be a bad ICM. Can you maybe get a video of the problem?

StraightTimeStirrups

So what is the deal with your problem? Ask for help and no follow ups! Did you get the problem fixed?

Kevin97ss

From the limited information it sounds like its popping through the throttle body...possibly from an extreme lean condition. Has the fuel filter ever been changed?