As above regarding timing chain issues - but would expect you would hear the chain rattle.From memory the crank sensor feeds signal to the EDIS module, which then fires the coils.The ecu outputs a spark advance signal to the EDIS to provide spark advance as engine speed increases.If the EDIS is not getting this signal the engine will still run (EDIS will give default advance, 10deg I think) but will feel really flat and unwilling to rev.Check wiring from EDIS back to ecu - I did quite a bit with the BOA some years back and seem to remember the harness was sh$%*!