car dies at idle, cruises funny, etc..

[damonzex]

ok, so since I have aquired my cobra it seems to have a few problems:

 

1. The most noticable problem is that it just dies at idle. It does this fairly often, maybe about 25% of every time i stop.

 

2. The next most noticable problem is when im cruising at around 40 (in 4th), it will jump back and forth. The best way i can describe it is if someone was abruptly pushing down the pedal a tiny bit every other second.

 

3. The next problem I am noticing is that sometimes, when I am at about 75% throttle in second, it will suddenly jump forward, as if it gained another 20 hp, until i shift to third.

 

I know very little mechanically about cars, so would someone mind chiming in and helping me figure out wut the problem is? Thanks a bunch

[nurkvinny]

SES light on? I'm a GM guy, but sure sounds like a mass aif flow sensor/ MAP sensor, or your car's equivalent.

[damonzex]

my check engine light is always on, no cats

 

I have had a few friends tell me its the MAF (yeah i have one)

 

might clean it 2morrow then

[RUTAN TA1647545492]

ALL 4.6/5.4 fords have a problem with the rubber ends of the pcv tube splitting. Which changes itake vacuum and it has the same symtoms as a MAF.

[damonzex]

pcv tube looks fine, no cracks and is completely on..hopefully cleaning the maf will solve my problems!

[Guest øctane]

Even tho your light is always on it might still be good to run for codes on it, sounds like the comp. is trying to make up for a leak or a dirty sensor somewhere. Check for TSB's and run your codes and that might help you narrow down the source.