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stalling / misfiring when revved but idles and starts great

badnews

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badnews New Member

badnews

Posted
Posted

just bebought a 1990 gm2500 sierra.  Last owner just put in new plugs, wires and cap to solve the issue I just purchased.  It starts and idles terrific but any little gas will cause it to stall out.  I got a new airfilter and cleaned out the injectors as the spray was not uniform and looked terrible.  The spray from both injectors looks much improved but problem hasnt changed.  It is a misfire.  Wasn't obvious to me without eyeballing the throttleplate while revving it but that sure is what it does when I look.  I had to take off but maybe Ill get back to check timing?  I dont know.  Check or replace coil- thinking just resistance test if that is sufficient.  Any ideas?  Ill check the book for some.

Markus Escamilla Enthusiast

Markus Escamilla

Posted
Posted
2 hours ago, badnews said:

Fixed it. Timing deal had to play with it.  Still a little advanced but its running.

Use a white paint marker on the timing mark when you use your timing light...it helps a lot

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