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I think you’re running a little rich. That’s what I think.
Regap them all and throw them back in.
Check your fuel pressure, see if you have any driveability codes, like O2, or EGR . Fix what ever you find. If you’ve got a slow start issue, that’s something else. Fuel related…
I had this back fire issue on starting. Turns out it was my camshaft Position Sensor was “F”ing up. Set two codes for it. Reading low on start and high when running. Causing a giant backfire out the exhaust every start attempt.
Now, I just charge the fuel system and it fires right up, holds 1100 rpm for about 3 seconds, then, drops back to 750-775 rpm’s, nice and steady growl now.
Note to self, don’t buy any cheap, no name sensors. Napa Gold line or AC DELCO.
Fawking no name junk cam sensor!
