Try to adj the throttle stop screw. Turn it out 1 turn then turn back in when it contact. From that position turn in 1/2 to 3/4 turn. Try this to get more air in. To play with the EHA L/R is the same. But only do 1/16 to 1/8 a turn each time & re test & re set idle co back to 50% +- 5% and 30 to 40% at 2000rpm. Try this see it work for your car or not. Good luck. :)

300ce running rough at idle and neutral/Park
 

Hello,

The symptom was what appeared to be missing at idle or and in Nuetrat/Park.This was with a very low idle, 500rpm.

Here's and update to my problem.

I have replaced the Igntion coil and HT wires. These were both checked out as OK, however, they fixed my problem.

Brian