ok well ill be driving down the hwy and when i try to cruze at a stedy speed it lick boggs down and if i step on the throttle a little more then it clears up and runs fine then when i try to cruze it happens again.it has a code 12 but i see no egr any where on it. the ecu is a vision tuned pwo.runns great every where but when you trying to just cruze down the hwy.

 

Sounds like it might be running a little lean. Do you have an air/fuel gauge?

 

ya and when im cruzing its in the green the whole time.i dont get it it all started this morning on my way to work i ran a wrx on the hwy hit 8k a couple times then it started to do this after that.im going to try to look into it in the morning i had a problem with my rotor bug the other day to so im going to check that

 

I had a similar problem and I think it was the TPS sensor. I'd lose power at steady speed, but at WOT it would come back. I've done a few things, but the TPS is the only part that I really replaced. Is it every time on the highway or random?

 

well its only seems to do it if i drive for a long time like 40miles or if i run the **** out of it then when i try to just cruze it does it. it has a full msd ignition system and im thinking my 6al box may be over heating.i mounted it in the car right behind the center consel any way i drive 68miles one way to work every day and it drove great all the way till about 2 blocks befor work then it started doing it i got on it and it wouldnt even rev past 6k so when i got to work i felt the msd box and it could fry and egg onit it was so hot.i waited till lunch and went back out there let my car warm up then took it for a drive ran perfect pulls to 8500 with no problems.any body else have a problem with a msd box?

 

the other thing is it cranks for a wile befor it starts.it has good fuel pressure,timing is dead on,everything seems to be in good working order

 

listen to your fuel pump prime and stop engine light will come off same time then turn key.

for your bogging issue i would say check your ignition trails .