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poor mileage
check air filter - should be able to see the sunshine through it when you hold it up in front of the sun.
check timing. too advanced causes it to retard a lot. too retarded gives crappy mileage. other hint is exhaust gets really hot.
check fuel pressure. too low and engine runs like crap.
02 sensor is another thing to check. you can put a volt meter on it and verify it is working.
check compression. a dead hole can mess things up.
pull valve cover. make sure valves all seem to lift correctly.
check you have the right engine. LOTS of swaps and if someone stuffed a d15b7 with a Cx/Vx ecu, you will have a weird combo.
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