96 Grand Cherokee 5.2 . After an abrupt stop the engine stalled and was hard to get started. The next day it started but idled rough. Installed new plugs seemed fine. Next day turned over no start. New crank sensor no start. Checked fuel filter, it was very dirty replaced it and got it to run. Runs with miss at idle and when accelerated(punched down) at 40mph misses and vibrates badly. Won't start when cold. new rotor, dist cap,and wires still the same. Checked fuel pressure 47psi and the fuel filter ok. Checked spark (with timing light) at coil has intermittent spark. The spark looks good at all plugs but one #8 has very intermittent spark. please help

 

Moved to GC tech area. You should get more response here.

 

what plugs did you put in it?

 

BOSCH PLATINUM'S. Forgot to mention that there are no check engine codes.

 

try going with the champions. thats what came in them. sometimes different plugs can cause it to act weird

 

I had to upgrade my plugs as well. what about o2 sensors?

 

No start cold today. Had weak spark at coil wire when cold. Tried new coil started and runs good, no miss at idle or on acceleration. Will post in morning when try to start cold. I might try the champions, read something about them before.

 

sweet keep us posted

 

Started right up this morning. Took it on a drive while cold runs good. Thanks for support. This is a great forum glad I joined.

 

im glad to hear that.

 

humm I may get a new coil for my RIG.. seems mine cranks hard in the cold deff...

I would not use BOSCH anything...

On the other hand ME PERSONALLY.. I hate champion..

I would use NGK plugs (no need for platinum)

 

champion is what came in them from the factory

 

yes but as with most things, products have improved in the last 10-15 years so there are other things out there that may be better then OEM

 

yeah but the plug has also changed