backfiring/sluggish acceleration. EB GL V8
can anyone help. I have a eb v8 series 1 and have a problem.
when started and driven cold, slowly it will start to missfire. then when driven the vehicle wll not react to throttle after crusing for 30 seconds. After coming arond a corner 500 m from my home, with the car dead cold, the vehicle wll not react to the throttle at all. if enough throttle is pressed and held, the car will sometimes backfire, and behave like it just off idle, the vehicle allways comes good after around 3 0r 4 seconds of doughyness and surges on without moving the throttle any more. when vehicle hot problem occours, but not as noticeable. vehicle allways seems flat when throttle first moved, but picks up in a couple of seconds if you hold your foot where it is. i am a mechanic and have swapped maf with another car, replaced coolant temp sensor, whole ignition system bar dissy body and hall effect sensor replaced, checked tps voltages, signal etc. suspect it may be in ecu because when it goes away, and vehicle surges, it goes quite well. Has anyone seen this problem before? any help greatly appreciated, running out of ideas.