[Porchdog]

Well I'm back - but with the opposite problem.

Now the car tends to go full rich - like 10.0 - as rich as the AEM will indicate. When it first happened it came and went. I finally had it happen close to home and started troubleshooting. All indications are that the frequency valve is operating properly (I don't have an oscilloscope). I cleaned the throttle and distributor plates and thought it was fixed - but it came back after a couple days. Now it's not so rich (Like 11.1 -11.5 at idle) but very sluggish and backfiring. once it gets over about 2200 RPMs it comes on like gangbusters and the AFR comes up.

I checked ignition timing and it's dead on, smooth advance, no sign of spark misfire on any cylinders.

Could I be having trouble with the fuel distributor? Possibly try injector cleaner? I don't have a good source of ethanol free gas, but it almost always gets Shell premium.

Thanks guys