Kieth,

You can access and read the On Board Diagnostic (OBD) codes yourself. The procedure and code definitions are in the 700/900 FAQ "Feature".

I think '89 was the 1st year for the "RPM" (aka "Impulse") Sender, which if yours is the original one, is a likely suspect.

The sensor is less than $30 at FCP Groton, and not too hard to change (10 minutes or less, if the hold-down bolt and sensor body free up with no problems).

It's at the top of the transmission bell housing, at the rear of the engine. It poins down to sense magnetic pulses from the flywheel/flexplate. When you can see it, you can't touch it, and vice-versa.

If it misses intermitently (as many posts here attest), you'll lose Ignition, which in turn kills Fuel Injection, till the pulses resume.

Hope this helps,

Bruce
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67