Originally Posted By: Reddy45
Originally Posted By: KrisZ
If you are still getting the misfire code, check for fouled spark plugs.
This, and a good wide open throttle run down the highway should clear out the junk...

That did it for me. Though my CEL was with a different product.
Simple, Techron Concentrate, the 5-6$ stuff OTC at Walmart. I followed the directions to the "T" - take the tank to near empty (drove the vehicle back and forth to work/home once, at/below E) - pulled into the station, dumped the bottle in the tank, filled up with 12 gallons of gasoline, and cruised around as normal. I actually "took it easy" on this tank, since I heard the Techron concentrate has some magic in it to fix incorrect fuel gauges, etc....something in it can de-foul the fuel sensors in the tank or so I guess (reads that way on the bottle too even, and touted many testimonials on 'vette forums!).
So anyways, about 1/2 way through this tank (I wanna say the 4th day on the tank of gas) a CEL comes on at a traffic light....mmmm....well, I drove around with it lit for a couple days, checked the gas cap since it's a common problem for the CEL to come on if the gas cap comes loose, but nope, that wasn't it. Anyways, I was headed to work, and I took it WOT on the on-ramp/merge lane on the highway, and wham, off the light went.
It must have cleared some blockage (or the bulb died in my dash board? lol). I still never went to check the code...but was told the code should stay in the memory until a code reader "resets" it (or I pull the negative battery cable, flicker the head lamps, and honk the horn onto all stored current flushes out).
Funny, I've ran seafoam (crank case, pre-oil change as well as the tank), Berryman's B-12 CHEMTOOL (full tank of gas), and Chevron Techron Concentrate, and of all things, the Techron concentrate gave me the CEL

It must be good stuff lol.