Question about 1998 Chevrolet Tahoe
Engine runs great except when regaining speed after a downshift to pass or go uphill. hesitation and loss of power triggers a misfire code that clears in three drive cycles. have changed plugs ,wires, cap, rotor, entire sfi, fuel and air filters.
Problem is almost always plugs, wires, or coils/ICM. I have seen all three, they all act exactly the same with the symptoms you all describe. Sometimes CEL and code are present, other times not. Start with cheapest solution and work your way up (plugs & wires, coils, then ICM) The coils can be tested with a spark indicator individually, plugs visually inspected. Most auto shops can test the ICM.
Posted on Dec 16, 2009
Egr valve port hole have to remove the intake to clean but that's my problem rite now on a 4.3 vortec the port hole gets cloged with carben not slowing it to work properly.
Posted on Jun 07, 2011
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