Mechanics

CHEVROLET SILVERADO DISTRIBUTOR PROBLEM

1997 Chevrolet Silverado • 202,000 miles

I recently had my distributor changed out because the hold down on the cap broke and now I have 4 dtc's p0300 random misfire, p0420 x2 catalytic effientcy below threshold, and a p0430 now my truck misses terribly and I lose overdrive when it's cold but after it warms up the miss goes away and regain overdrive. I took a temp reading on both the cats and they are up to spec in that aspect next is a back pressure test. Wondering if this is due to bad o2 sensors or what I don't understand why the problem improves after its warm! HELP
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November 7, 2012.



No, temps are not an indicator here.

The efficiency of the cats is gone. Thats the 420 and 430.

Random missfire may be from the distributor change. Have the shop re check there work.

Roy