stumble bumble cold blooded thing

[Mattsmerc]

I have done the search thing for this type of problem. but there is soooo many ways to go. Here it is. I had the svt program in for a good 6 months or so, an now I have a rough idle when its cold. Put it in gear and it almost stalls. lately I have black pipes, they never were black inside before. To rich maybe? running high test gas 91 92 octane always. got back from my trip to Ohio- it ran like a champ the whole way- then it started this stumble bumble crap. yesterday i took out the programer an put back to stock and still the same thing with less power. Any of you tech guys care to chime in an help :depress: please :depress: see my sig for all the things I have

[Constable]

Do you have plugs in it?? I just swapped out my NGK TR6's for TR5's. It made a world of difference and runs alot smoother when it's cold. The TR6's were equivalent to the Ford AWSF-12-C plugs and the Denso's... too cold for a N/A Rauder...

[Mattsmerc]

I thought of going back to stock plugs

[roadpig58]

I have done the search thing for this type of problem. but there is soooo many ways to go. Here it is. I had the svt program in for a good 6 months or so, an now I have a rough idle when its cold. Put it in gear and it almost stalls. lately I have black pipes, they never were black inside before. To rich maybe? running high test gas 91 92 octane always. got back from my trip to Ohio- it ran like a champ the whole way- then it started this stumble bumble crap. yesterday i took out the programer an put back to stock and still the same thing with less power. Any of you tech guys care to chime in an help :depress: please :depress: see my sig for all the things I havesounds like an iac motor or "idle air control"

[KilledKenny]

MAF sensor (Mass Airflow Sensor) could be the problem, easy way to check is to unplug it and see if your problem disappers. (note: unplugging may trigger a Check engine lamp.)

[drobin]

I'd start with the plugs first..........

drobin'
Donald