Help 5.3 4 cylinders are misfiring
11-22-2012, 05:03 PM
#1
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Help 5.3 4 cylinders are misfiring I have a 68 firebird with a 5.3 and an LS1 intake backed up with a turbo 350. I have gotten it to turn over but there is never the right idle and has no throttle response. Pulled spark plugs, 3-4-5-6 cylinders aren't hitting. changed out injectors-no fix. Coils are good, fuel pressure is at 59 psi. Any suggestions why it might be misfiring? I also spliced in new injector pig tails.
11-23-2012, 01:30 PM
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what harness are you using? There will be two switched power wires going to coils.. sounds like either a fuse is blown or there is a break in the connection on the coil pack harness
