Hey guys, i had the issue a whle ago about only firing on 5 cylinders (when harness is detached from coil pack, no loss of power) so it had seemed to get better until recently. I am replacing my water pump this week so thats one problem, i dont think that would have a correlation with my car running very sluggish. At times it runs fine, nice and responsive and quick, but at any time, if i come to a stop, or get out of the car and start it back up, it can run so sluggish it feels like it might not make it up a hill. It feels alot like a clog or something, i am thinking injector, could a bad injector cause me this and me to not fire on only one cylinder?

 

Of course it could be an injector if one were bad, if theres no fuel in the combustion chamber, then theres nothing to combust.

 

I'll second the bad injector theory, they're more common to go than coil packs

 

definately one of the injectors. mine's ran like crap when it was on 5 cylinders... worse on 4.