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decrease in gas mileage from 25MPG to 20MPG 200 1989

Sounds like it's running too rich. I have had similar problems on my 88 and 86 244's, both B230F.

In the '88 I found a hole in the bottom side of the air hose, replaced hose. I replaced all the things you did, plus O2 sensor and coolant temp sensor. Still have the problem, but it's a little better. Also check the thermostats, both the one in the air box and the one in the cooling system.

Good Luck, I hope this helps.

Bob

:>)






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