2111 code....check engine light

[tom winter]

Doyt - Others who are more sophisticated than I may have a better idea of
your problem and the solution, but are you running the highest octane gas
available? I had a similar problem with my '87 5000 after rebuilding the
head and switching gas solved it. In fact, I was going to pull my codes, but
the light has yet to come on since I upgraded my petrol. Just a thought. . .

Good luck,

Tom