car stuttering after about 20-30 minutes driving

[lachachmtl]

hi everyone ,i got a weird problem ,my car starts to stutter and hesitate after about 20-30 minutes of driving.

Before that,it runs fine.

no codes pop out on the scanner,no check engine light,no hose disconnected.it does that on all gears also between 3000 and 4000 approx.

2 mechanics said its misfireing.The fire cuts somewhere.we changed the spark plugs,wires ( wich i was sure wasnt gonna do anything ) then the crank sensor,coil pack,module and no change. the car misses between 3000 and 4000 rpm ,if you rev it more then 4000 it seems fine.

what else is there to check? the car starts good,no fuel pressure drop either.

ps ; whoever built this car,can you please open up a garage so we will at leats know 1 mechanic that knows how to fix it,cause everywhere i go and try to fix this car, no one knows what their really doing,just changing pieces left and right.

you could email me directly at lachachmtl@hotmail.com

passsed 3 long days at the garage so far, no problem solved yet :frown: :frown:

 

[PaCemkr86]

do you have any scan tool data? like a direct scan file ?

does your car have a stock maf on it?

 

[lachachmtl]

i dont have naything so i bring it out to the garage. he did put the scanmaster on it and no codes popped out,everything seemed to be normal he said.

i did change the mass air flow sensor 2-3 times and the O2 sensor about the same but they always had a code that popped out and not the same symptoms im having now.