Horrid idle, even worse before boost

[spiritRT66]

Ok, i just got in from looking at his car...It idles like its got a big cam in it, when you feather the pedal it sputters then its like the car is coasting, but as you gradually push the pedal down itll jerk out of it and drive, under boost everything is fine...going into boost it runs like garbage. Anything but a heavy foot and the car runs like poop.

[macncheese]

did you pull codes yet? turn the key on-off-on-off-on in less than five seconds, and the power loss lamp will start flashing binary codes at you. flashes, pause, flashes, big pause is a number, so....
flash
pause
flash-flash
big pause
flash-flash
pause
flash
big pause
flash-flash-flash-flash-flash
pause
flash-flash-flash-flash-flash

would be 12, 21, 55 (55 is end of test)
tony

[spiritRT66]

No codes, i was outside for a good hour or so redoing some of the hard lines with rubber, idle fluxes 100-200 rpm up and down, then smooths out, randomly....after driving and coming to a stop in nuetral the idle will flux 1000 or so and sometimes stall from 1000-0 and back until stall, sometimess it smooths out. WHile feathering the pedal, it will pop a bit, then you get nothing, like the car is not running but as you slowly push the pedal down itll jerk out of it and run. Very annoying. I thought my R/T vac leak was the suck...this is killing me :/

New FPR, TPS already. Still may be a crappy TPS cause the idle is all over the place. But i have no idea.

[frostburner]

i have the same prob in my 89 daytona shelby.. let me know what u do to fix it.. i redid all my vacum lines and it helped a bit but its still bad.. i basically have teh same symptoms

[spiritRT66]

Ok, had it running better last night he comes over this morning, its like i never redid anything. Car only runs crappy at idle off the line and before boost, during boost its flawless, im gonna go drive into stuff soon, this is crazy

He also has a new fuel filter , add that to the list of TPS and FPR, fuel pump tested good, hes getting spark.

Is the wastegate sticking a possibilty?

Also when the car runs smooth the pedal is easy, when it starts running poorly, its like it gets a bit tighter, if that makes sense, well, i suppose that could be because you have to push it down farther to get the job done. shoot me

[spiritRT66]

Ok, new development, plug cloeset to the drivers side door was wet, rest were dry. Well tip was dry, threads were wet a good amount. Any ideas on this one ? anyone?

[csxt#10]

blowby do a compression test in number one cracked piston or bad rings.just had it done to me

[spiritRT66]

Ok his timing belt is loose/stretched. Its flappin a little bit on and off, and squealing.... i can probably roll it off the gears with my fingers if i tried hard enuff. Wheather or not this is the problem, which it very well could be, it needs to be replaced. Joy

[spiritRT66]

Fixed....wires to the o2 sensor were resting gently on top of the turbo....fried to a crisp. Replaced...done. Still needs a belt though :/