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When I run my engine in park at lightly high RPM it has a regular fluctuation, it does the same at idle but not so regular. I installed a new EGR and EGR valve, I checked the MAP, IAC, TPS and their...

Friends,
What do I do now? I removed the old windshield the wrong way on my '90 GMC pickup. I didn't cut the old adhesive close to the glass as I should've and after I had the glass completely...

WOW! I cannot believe that I forgot that one.

Friends,
I am fed up with these horrid inaccurate wiring diagrams, Hanes and Chilton manuals are my primary complaint now.

SO! Where do I find an accurate electrical schematic for a '90 GMC...

You helped me get my head right earlier, I am now more interested in the amps but my Fluke 77's current checking capacity doesn't work, which is why I got it for $5 at a swap meet., so I have to...

Great answer! I was stuck on the pre ECM car method where you do check for voltage and less than three volts is good when everything is disconnected.

You are right! theoretically all battery...

Thank you for letting me know that I did not make it clear that
I want to check the battery drain, with the engine off

What Voltage and current readings should I be reading with the engine off when I disconnect the positive cable and put the positive VOM probe on the battery positive terminal and the negative VOM...

I am sort of up to speed (in the slow lane), I returned that one to Autozon for $76 and got one at Pick A Part for $46 with both an ASDU and a Calpack. I haven't yet tried it as I am checking out...

When I buy a PROM for my 1227747 ECM should it be one or two chips? The reason I ask is because my ECU has two empty sockets, a large one and small one, the problem is that I thought I was ordering...