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I swapped in a new cps today and she purrs now fixed my phantom misfire too. I never thought about that with the dielectric, I've never had any issues just filling the connectors with it. Searching around it seems to be a controversial issue. Thanks for the help guys

So I went through and cleaned every connector and reinstalled with dielectric grease. Now I have a no start condition no spark to the coil fuel/starter is fine. Something arced while I was doing the starter relay is there anything downwind from this that controls spark? I'm going to put in a...

I'll check the cam sensor. I streched that cluster of wires to a different spot and relocated the vacuum canister before I noticed this so I'm going to check grounds and reinstall all the wires. I mean i tapped the throttle body to the map sensor per cruiser54

Thanks! It was bucking pretty bad across a few hundred feet of smooth dirt road the other day totally makes sense if dust has something to do with it.

Ignition is fine. It's the engine, makes it pretty annoying to drive on washboard

So I replaced the cap and rotor on my 89 4.0, also beefed up the ground by the dipstick and ran a better vacuum line to the throttle body. Since then she runs great, unless on a bumpy road. After a good bump the tach drops to zero then power returns. It only happens on bumpy roads so it's...