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Q: Really a 1988 740 gle wagon on 1990 Volvo 740

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine sounds like it's only running on three cylinders but I know all plugs are firing and timing is at 12 degrees btdc. Also seems to starve for gas when approaching upper range of engine rpm. Any suggestions out there?
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Could be the MAF sensor, fuel pressure regulator or something else, hard to know without checking the trouble codes, fuel pressure and a few other things. I suggest you check the codes at pin #2 and #6 on the diagnostic connector, and check the fuel pressure.
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