I rebuilt the 2.6, basically everything is new including head, cam and valvetrain. Engine ran and idled well but when I drove it it spit and sputtered and backfired blowing out the muffler. Limped it the roughly 200 yards back home and no start since or it will start and run on 2 cylinders. Compression is good 190 psi across the board. Injectors are rebuilt and I verified pulse, voltage, internal resistance etc. I have quadruple checked the timing and tried multiple distributors. Tried two different ECM’s & two different igniters. Checked all relays and fuses. Fuel pump is new. With a crappy little inline tester, I get spark at all plugs but since I have fuel and compression I’m wondering if for some reason the ignition is not strong enough to spark under compression especially at 190 psi. Does this make sense? Anything else you recommend checking? This is maddening.
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