Thanks for the tip. I think we will double-check the computer ground. We made sure the headlight flasher switch was grounded, and also put a new ring terminal on the computer & other FI grounds on the intake manifold. We also ran a ground from there directly to the battery negative terminal - still no luck. I'm leaning now toward some sort of electromagnet interference because Dad has moved the computer from its original location that was somewhat isolated from other electrical circuits to an area under the dash where there are a lot of wires, new relays, etc. When we pulled the computer out and layed it on the driver's footwell, we could get the symptoms to go away if we moved the headlight flasher wire far away from the computer. When we brought the wire back close to the computer, the symptoms came back.....of course the elctrical interference could be exacerbated by a poor ground somewhere. We even grounded the computer case back to the neg terminal on the batt with jumper cables - that should be a good ground!

Greg