Question about Chevrolet 2500

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1998 Chev K2500, 5.7L..just had full tuneup ie cap, rotor, wires, plugs. had misfire on 5&7 prior to tuneup, now misses on 1&2...moreso on number 2. has code P0174. Miss appears at idle, above idle, miss is gone. No codes for misfire in history. Discovered during tuneup that cylinder 2 had an ac delco 41-803 spark plug while all 5 cylinders had 41-932 and two others on right bank had ap605(autolite equivalent of 41-932)

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Check compression in all cylinders to see if its getting the same all around if not then thats why its misfiring but you want the same plug all the way around mismaching can hurt an engine

Posted on Nov 13, 2009

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The plugs shouldnt matter they are the same just different manufacturer.

Have you distributor module checked out.

Posted on Nov 13, 2009

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Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
1)all spark plugs
2)do a oil change
3)spark plug wires
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5.injector timing
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