Quote:
Originally Posted by beech2000
In stock wiring form NOT dual ignition. Pretty sure second system is for unburned fuel during exhaust upstroke. (Emission purposes). I understand simple wire change order on coils makes it true dual ignition but I haven't tried. This may help narrow in on your situation by swapping wires plugs and coils.
Ignition issues would be my start since it's easy and may explain the intermittent power restoration. What happens to your STFT when using propane around suspected vacuum leaks? Still check fuel pressure and rule it out personally rather than by theory. Also have you cleaned the MAF?
Lastly, do you get a response (loss of engine rpm) when drawing a vacuum on EGR valve at idle?
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I do get a response when egr is activated at idle: car almost stalled. I've been thinking of replacing the fuel filter and eventually cleaning the injectors as part of my vcg job.i cleaned the maf and the readings seem to fluctuate normally based on throttle activity. I'll definitely change the plugs and wires when I do the vcg job just as part of regular maintenance since I got it with 183k.