Help! 97 Cobra Single Turbo

[orngpel]

My car has a stumble under high load. I datalogged the RPMs and while driving @ 2000RPM there are these spikes up to like 5000 RPM. Has anyone see this before? Any information is appreciated. It does this even without a heavy load.

 

[svtshadow]

Spikes of what? Fuel pressure, Aits, AFR?

 

[MOTOWN M]

Sounds like you may need new ignition coils.

 

[orngpel]

Spikes of what? Fuel pressure, Aits, AFR?

The Spikes are in RPM but they are ony on the datalog they dont relect the log and you cannot feel them. The motor obviously doesnt jump for 2000RPM to 5000RPM instanly

Sounds like you may need new ignition coils.

The ignition coils are brand new motorcraft ingnition coils.

 

[01yellercobra]

I see them once in awhile. I ignore them.

 

[466scj]

same here^..i seen the same thing on the dyno a couple times.We (my tuner)also ignored them.