I was performing the 90K mile maintenance on my 1986 Toyota pickup, and decided to run some Sea Foam through it just to be sure everything was clean. I poured about 1/4 of the can slowly into the carburetor of the warmed up (and running) engine. It then coughed, backfired through the carburetor, blew out smoke and died. It restarted, but since then it won't idle at all, but will stay running very roughly if I give it lots of gas.
I read somewhere else that Sea Foam can screw up the sparkplugs. So I took all of them out and cleaned and inspected them. No change. The engine will start but then die immediately unless I give it a lot of gas and keep my foot on the pedal. As soon as I let my foot off of the pedal, the engine sputters and dies.
Did the Sea Foam cause this? I'm very disgusted, because the engine was running fine beforehand. Next time I'll leave well enough alone.
Jason