I have a problem when I try to accelerate at full throttle, Letī say Iīm driving at 20 or 30 mph, then I floor the pedal to get full power, then the engine chokes like if its not having enough air or proper inition from the sparkplugs or feels like if I were trying to push an invisible obstacle because the acceleration is not as strong as is supposed to be. I used to have wheelspin on 1st and 2nd gears at full throttle but now the car accelerates erratically, and even overboosts and cuts ignition and/or the revolutions climb to approximately 3500- 4000 rpm and then stay there for as long I fully press the throttle while the acceleration sucks.
Letī say iī not able to challenge even a turbocharged kia.
I have an unmodified stage 3 w/toys, (pcm control, everything mopar) with 3 inch o2 housing and 3 inch catback, stock airbox with KN filter, vpower ngk sparkplugs, granatelli wires, etc.
I checked for vacuum line leaks (there are none), checked the turbocharger, worn sparkplugs, computer codes, etc. I couldnt find anything wrong. Apart from this problem the car runs fine when idle, driving or cruising or accelerating moderately. Fuel consumption is normal, not any other problems.
Another symptom is when I press the accelerator pedal from zero to to half travel, the acceleration is smooth and seems fine, but after half pedal travel specially if I press the pedal suddenly to the bottom, then the car behaves erratically, it will even overboost when on DAB 2 or 3 and cut ignition (DAB 1 keeps the boost at 15 psi), or it will try to accelerate but with a lack of a strong pull, like if the car were pulling a heavy trailer and the revs climb up but slowly or it will accelerate moderately fast but then behaves like there is an invisible limiter at around 4000 -5000 rpm and the revs get stuck there.
So short story, my stage 3 SRT-4 is not accelerating like it should I even avoid full throttle so I donīt have this kind of behavior.
The last thing I tried to diagnose is the TPS sensor, I measured the voltage from the sensor with a multimeter and it looked fine at full open throttle the voltage was like 4.7v and progressively moved as the throttle plate opens and closes.
I will try to make a video of this problem because is very hard to describe the car behavior thatī why the long explanation. I think I checked everything and ran out of ideas, thatī why I ask the forum for help to find the solution!