[colacharlie]

Hello all.

I have a 2.7 2002. The car starts okay and drives okay as long as you stay on a constant throttle. As soon as you try to accelerate a bit harder the car judders and appears to be misfiring. I have change the plugs and a couple of coil packs which looked bad. I have plugged the car into a Durametric (just arrived) and it shows no misfires on any cylinders. I’ve removed the oil filler cap With the car running and the car does idle worse so I’m guessing it’s not the air oil separator.

At any time when driving, if you hold a constant throttle the car runs great, but as soon as you put the car under load you get this big juddering. I will post a picture of the Durametric read out in a while. I only purchased the Durametric tool recently so any advice on how to use it to see what’s going on will be very helpful. By the way the geometric is showing no fault codes at present when driving.

Here’s a list I’ve compiled in case someone sees something I should do first….

Crank position sensor?
O2 sensor?
throttle calibration ?
air leak- vac leak test with smoke?
How test fuel pump is okay?
Idle control valve ?
Dirty throttle bodies?
Fuel pump relay?
Injector sticking open?
Injector seal issue?
Check MAF voltage- new one now installed.
Unplug MAF to see if anything changes?
leak in the intake manifold?