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Thank's well aware of set timing steps also checking for correct TDC as discussed in prior thread above. Also my car only backfire in park only not necessarily at rev limited as your saying it's intermittent I've triple check timing TDC on top also at crankshaft and firing order at wires all new parts disburtor is rebuilt also which is why listed parts or work I've done in past year. While driving there's no back fire car respond well no smoke from exhaust no check lights no oil burn or leaks. I'm to look in direction Bruce has mentioned to me fuel pressure regulator which hasn't been changed however fuel pump has been replaced .
Grateful for your help though
There is a 'set timing mode' the car has to be in to properly set the ignition timing.
What it sounds like is really happening.....
When the car is in park....you can only rev it so far before the computer will start turning it off.....a rev limiter. It sounds like it is getting into the rev limiter. That would be a normal vehicle operating condition.
First my email Grammer isn't the best sorry back fire happens only at idle when rev up engine below 4,500 rev limited you mention.this problem has always been since purchase car. I've even check my settings both on timing and thottlebody. 10 degrees on timing. Air mixture screw isn't touching throttle. ISC 13.0 tps is +1.1 all new vacuum lines throttle body and egr port are clean spotless. Would leaky injector cause backfire I think you told yes a while back about a year ago.