GEes3

I have had this problem for 3 or more years. It happens once every 1-2 months it used to only happen once every 3-4 months. It doesn't seem to matter if weather is hot or cold, wet or dry. It may happen after a 5 mile trip or 50 mile trip. And it always fixes it's self after it sits a few hours. I assume once it cools down. It seems after coming off the free way and sitting at a stop light it starts running rough and some time the speedometer will start jumping around going all the way up and down (engine does not race). I can always get it home. And I tell myself I'm going to figure it out but then I drive it again and it's fine. Does any one have any ideas?

12340987

Does it happen only if the car is warmed up or cold?

ktranne

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GEORGE_JET

Check the battery cables, clamps, and repair any signs of corrosion. The issue sounds more electrical (due to the intermittent nature). Try un-mouting the ECM (while still electrically connected), lightly hit the ECM with your hand, and also try heating with a hair dryer, see if you can get it to act up. Also check the connections on the ECM

yeskay

could be the PCV.

GEes3

Thanks, I will try the ECM to see if I can get it to act up. I will probably replace the PCV to.

BoostedE21

If the ECM faulted and made the car run very, very lean, you could encounter power loss - and it would heat up the catalytic converter, which might cause it to smell like rotten eggs (sulfur) - but I really can't see what would cause it to randomly do that. Check for stored codes and see if anything comes up.