Car Runs great.... only after 3000RPM

[preludeachris]

It seems to idle ok until you put any kinda of load on the engine, It misses and hesitates and some times stalls, It hesitates all the way up to 3000rpm or so and from the it seems to run great at wide open throttle, Anything under 3500 though and its just runs horribly you cant open the throttle any more that 10 to 15 % any Ideas?

Right now I have no wideband and Im running stock Injectors at factory waste-gate pressure, with 272 cams

Someone suggested that could be the bigger cams, there not enough fuel at lower Rpms? I dont know it doesn't sound right to me but im in the dark.

 

[Boostdriven]

Check the ignition and mechanical timing.

Do you have a boost gauge, if so what is the vacuum at idle?

 

[preludeachris]

Check the ignition and mechanical timing.

Do you have a boost gauge, if so what is the vacuum at idle?

Ignition and timing are good, I dont know about vacuum I can check tomorrow.

 

[__89TalonTYLER_]

a lot of bigger cams are just made for racing, high rpm

 

[jkeesee21]

^^^+1 Definitely sounds like a boost/vacuum leak. Thats what it was with my GST Spyder with these same symptoms. Underside of a coupler was torn.

 

[preludeachris]

Vacuum is around 10

I Just found out that the MAS wasnt plugged in so yeah...runs pretty good now

 

[gieri002]

That vacuum seems low. With Crower 272s I see about -13hg, when stock it was around -21hg.

 

[preludeachris]

That vacuum seems low. With Crower 272s I see about -13hg, when stock it was around -21hg.

It was bouncing between 13 and 11 I didnt check it after I plugged in the MAS I was just happy it was something as simple as it was.