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firing order is 1432, starting at the bottom coil pack which is number 1, also the number 1 piston is next to the coil pack,working right to left 1234.
this happened to me, only she was misfiring as opposed to not firing at all, i got the plugs and leads replaced (one needed a helicoil as the threads were worn) but chevrolet themselves did the job on it and told me the the camshaft was blocked with old oil, they flushed that and reflashed the ecu, and she was right as rain again
however it could be a timing problem? not too sure of timing procedures!
have you changed the ignition wires? perhaps firing order crossed? if not coil pack or ignition wires faulty how do you know it is not "FIREING" on 1 & 4 have you tested it with a spark tester tool???
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