I would like to say I'm pleased with how the Thunderbird is running after the recent fuel-induction cleaning, but I'm not. I believe the cleaning, although it certainly didn't hurt, it just didn't produce the results I hoped for. I had the car on the open-road two weeks ago and it still wasn't smooth. It felt "bumpy' (not in the ride) and occasionally, it felt like it almost missed in a firing. Dillon wrote on the repair order of 7/9 that the spark plugs are in good condition, although recommending I go back to Ford plugs. The air filter has 20,000 on it...Ford recommends a change at 30,0000.
It is hard for me to justify putting more money into this. If you have any other ideas, I'll be glad to consider them. Thanks for your help.