Are you getting spark at the spark plugs, now? Might be a valve timing issue, if you have spark. How long since overall tune-up? Are there any applicable mil codes? You should be able to check mil codes, yourself. If your fully obd1 compliant, you use a jumper wire between the A and B terminals at the datalink connector. Turn key just till the dash lites come on, no further. The mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.