It only does it when you put a load on the motor. I changed the hose that had the leak. took it out for test drive ...around the block it seemed great, good idle. let it run in my driveway seems okay idled okay. the gauges all worked warmed the car up to operating temperature, still was okay. then when i drove into garage I could feel the missing. My neighbor gave it gas said he was testing it and that is when he said it misses when he puts a load on motor. He said the missing might be from old plugs. I will share this post with him, about your ideas...He is on vacation... I really appreciate your help thank you.