Rebuilt my 87 dodge daytona 2.2 turbo II...upon completion the car idles fine at normal idle, but when rev up the motor to 4000+ rpm or accelerate going down the road, the engine wont hold constant rpm, it goes up and down.

My thoughts.....

Engine Control Computer under the hood is malfunctioning because the one in the car mounted on passenger side is brand new....

The turbo is dropping boost causing engine rpm to be unstable under load..

A throttle sensor is faulty...

Help!!!

Thank you...

 

So even if you hold the throttle just a little it still has the same problem?

 

check for vaccum leaks and make sure the tps is installed correctly