Below is a list of things to work through.

Check or replace these items:

-Check timing

-Check throttle position sensor switch settings (will either be a
tandem set above trottle body or a single switch underneath)

-Temp Sensor II (I'd just replace this if it has over 100K miles, these
go out of spec frequently)

-O2 Sensor (sometimes a factory wire O2 will work better than a generic
splice-it type)

-Check for "flat spots" during operation of the AFM flap (See bentley
for pins to bridge and resistance values to observe) There is a
"capacitor fix" if this seems to be your problem.

-Clean <underline>all</underline> grounds

-Ground the AFM to a good ground (there is an M8 bolt hole on the back
side next to the harness)

-Inspect cap/rotor for carbon tracking

-Inspect all vacuum lines for leaks replace as necessary

If that doesn't yield results then:

-Check Idle stabilizer valve

-Check fuel pressure regulator

-Check wires

-Check plugs

Cheers,

Dave C.

Williamsburg, VA

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'85 GL Westy (His)

'91 Cabriolet (Hers)