97 cav 2.2l

suddenly started up running rough on a very cold night

within 1 min catalytic was red hot

its only running on cyl 2 and 3

no check eng light

i changed coil 1 and 4 with a known good one and still no spark for cyl 1 or 4

ign module?

pcm?

ran...

FIX posted 12/30/2008

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle