I put the NGK plugs back in and found a bunch of cracks on several vacuum boots on different vacuum tubes. I took it for a test drive and I ran likes champ for about 40 minutes and then the cel began to flash for a few seconds and then it went off. That happened about 4 times in 15 minutes. I couldn't tell anything different when that happened. What could this mean? I'm going to take the battery off tomorrow and try again. I'm wondering if the computer was just trying to compensate for the vacuum being different. Any suggestions or comments?