Montesittinup Posted January 4, 2012 Report Share Posted January 4, 2012 Hey guys I have a 99 Monte Carlo ls with a 3100 in it with 160000 or so.... I ordered 3400 head upper lower intAkes egr delete kit and a PCM from milzy about a year Ago. I got a lower intake gasket leak , decided why not put on heads n intAkes now... Mechanic tore down put heads intakes egr PCM throttle body on... New plugs also but now it is backfiring dying and a rough idle we are going to change plugs again put my old PCM on and see if changes anything or possibly the egr delete causing a issue not quite sure any suggestions or ideas would be greatly appreciated worst comes to worst gonna tear down put my 3100 heads back on and just use the 3400 intakes see if that's a issue :-/ not to sure where to start thx Quote Link to comment Share on other sites More sharing options...
White93z34 Posted January 4, 2012 Report Share Posted January 4, 2012 are pushrods in the correct order? spark plug wires routed to their proper cylinders? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted January 9, 2012 Report Share Posted January 9, 2012 compression check would be the fastest diagnosis. bet your mechanic swapped pushrods Quote Link to comment Share on other sites More sharing options...
brake Posted January 11, 2012 Report Share Posted January 11, 2012 compression check would be the fastest diagnosis. bet your mechanic swapped pushrods +1 the rear cylinders are a bitch to get to so a relative compression test would work here if you don't feel like digging around back there. if you or your mechanic have an oscilloscope, that is Quote Link to comment Share on other sites More sharing options...
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