Hey guys I've got one for you.
My truck misfires mostly when the engine temp is going from cold to hot.
Sometimes it picks when it wants to backfire. Air/Fuel??
It threw a couple codes (crank position sensor, down stream o2)
I changed both today. It sputtered slightly after installation then cleared.
I drove it 20 miles, parked it, drove it another 10 miles.
Ran fine the whole time.
On the next trip it started the same junk over again then went away. It goes away a few minutes after startup.

Possibly my problem is that the Jack-A who owned the truck before me cut the cat off because it went bade. It may be that it's reading the same gas stream as the front o2?

What do you think?

Thanks