Originally Posted by Mark rsa2au
Tested sensors with pin, then smeared dielectric grease over to help insulate.
Motor does idle but very lumpy, between 500rpm anf 800rpm. looking into the throttle body at idle it seems just enough air is getting through but the edges of the butterfly seem to get a fine line of white with ice and lumpy idle gets lower. One rev up and it clears the white ice ok.
WIll remove fuel filter and check, but will need a fuel pressure guage for safety.... will visit a bottle shop - for beer for mechanic!
High rev WOT still an issue with back firing / misfiring over 4100rpm. Changing to new plugs as previous plugs fouled from over fueling with faulty injectors - hope this works.
Did someone remove all of the plug wires at one time? Verify the firing order and base timing (you need to put the ECM in 'Diagnostic Mode" for this (you can use a paper clip, inserted in terminals A and B of the diagnostic harness plug, then raise RPM to 1000).