I have a 1985 z28 with a rebuilt 305 off of an 86, when i first got the car running it got about 12 miles per gallon now it's down to 8 or 9. the car has about 93000 miles on it. what should i do?

The engine has TPI (tuned port injection.

If you can't fix it, get someone qualified to look at it. If it's running that rich it'l burn out your catalytic converter.

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The older I get, the faster I was!

my 91 fireturd does the same thing, it used to get good gasmilage, (before my mods) now it sux big balls. I replaced my O2 sensor and all is now ok. try that, its only 21.99 at advanced auto , or pep boys. its either that or the converter is clogged.

worth a shot.

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Do a tune-up. I would bet money that if you pulled off you distributor and checked inside that all the contacts are corroded. Buy a new cap and rotor (pretty cheap) and you will notice a pretty good difference. I have gone through this with my 91.