just today, car started running real rough, from idle all the way up the RPM range. Did a quick ignition check, fat spark being delivered to all plugs at idle, no carbon tracking in cap or on rotor.
I am thinking it is running so rich that it is mis-firing.
Where do I look next?
I did check all vaccum hoses, and repaired them all, and Swapped AMM's with known good one.......

a oil fouled #4 spark plug was the entire fix.

MY 242 ran like crap, rough Idle smelly exhaust etc. I changed out the old injector seals that were hard as a rock, and for 10 bucks I couldn't beleive the difference. Obviously it was letting in air and running lean.Easy job too.

brickstr,

Check the Fuel pressure regulator (FPR) to see if it has a pinhole leak and is letting gas into the intake via the vacuum line. You can do this by pulling the vacuum line off the FPR and see if you smell gas there.

Since you believe the AMM is good, have you checked the O2 sensor voltage?

'85 was a year with the biodegradable wiring harness so you may have some problems there. Check the temp sensor (under intake runner #3) wiring. Often it is bad. If it is not making proper contact or the sensor has gone bad, it interprets the temperature as "extremely cold" and the computer causes the injectors to dump in extra fuel.

Just a couple ideas, hope some others will jump in...

Good luck,

TomD
'86 240
'93 240