Okey so many of you have probally read one of my other threads and kinda know my car situation, but anyways here is the problem. My car (131,000MILES)(automatic) is very very slow but after all i have done to it, it sure shouldnt be this slow. I have so far done the following stuff...
F150 4.2 just rebuilt, moly rings, new bearings, heads redone...
Hand ported and polished 4.2 heads
Gasket match ported and polished lower and upper intake
Morana racing 224/224 110lsa reground cam
Longer Push rods
Heavier comp cams springs and retainers
Bomz fenderwall cold air intake
Sniper 4.2 tune from dirtydirty racing
Mac longube headers
Mac h pipe with dual high flow cats
Mac catback
Trac-loc
4.10's
And ASP 25% underdrive pullies are on their way
and the fuel filter and plugs were replaced very recently, also 5 of the wires are brand new but one is unknown
Anyways my car is currently tuned to run at 800 rpms, but when it is first turned on it jumps to almost 2000 rpms, shakes, and kills. If i give it gas for a while it will then idle but fluctuate from 600 to 1200 rpms, but mainly hangs around 800. Then after the car is running for awhile and all warmed up, i give it gas from a dead stop and the tires dont even so much as squeak, they do however squeal shifting into second as it is tuned for a firm shift. Also i just came back from racing a bone stock GTP (1999 style) and he destroyed me. They have 240 horsepower, and i figured my car should be about that rwhp. Now the gtp does have 280 lb-ft torque and i expect mine to be less but not incredibly less.
So im thinking my fuel pump or possibly injectors are going bad, but then i dont understand why it would run fine at high rpms.
My Second thought is that i need a wideband because it is simply too much to tune without afr
My final and what i think is most likely is a bad pcv valve or a vaccum leak
The problem is that i cant afford to fix all of these problems, so i really to decide what the problem actually is, so any help would be GREATLY appreciated.
F150 4.2 just rebuilt, moly rings, new bearings, heads redone...
Hand ported and polished 4.2 heads
Gasket match ported and polished lower and upper intake
Morana racing 224/224 110lsa reground cam
Longer Push rods
Heavier comp cams springs and retainers
Bomz fenderwall cold air intake
Sniper 4.2 tune from dirtydirty racing
Mac longube headers
Mac h pipe with dual high flow cats
Mac catback
Trac-loc
4.10's
And ASP 25% underdrive pullies are on their way
and the fuel filter and plugs were replaced very recently, also 5 of the wires are brand new but one is unknown
Anyways my car is currently tuned to run at 800 rpms, but when it is first turned on it jumps to almost 2000 rpms, shakes, and kills. If i give it gas for a while it will then idle but fluctuate from 600 to 1200 rpms, but mainly hangs around 800. Then after the car is running for awhile and all warmed up, i give it gas from a dead stop and the tires dont even so much as squeak, they do however squeal shifting into second as it is tuned for a firm shift. Also i just came back from racing a bone stock GTP (1999 style) and he destroyed me. They have 240 horsepower, and i figured my car should be about that rwhp. Now the gtp does have 280 lb-ft torque and i expect mine to be less but not incredibly less.
So im thinking my fuel pump or possibly injectors are going bad, but then i dont understand why it would run fine at high rpms.
My Second thought is that i need a wideband because it is simply too much to tune without afr
My final and what i think is most likely is a bad pcv valve or a vaccum leak
The problem is that i cant afford to fix all of these problems, so i really to decide what the problem actually is, so any help would be GREATLY appreciated.
