Check those codes. There are at least a handful that won't set off the check engine light.
Once you do that, I'd check for vacuum leaks, the MAP sensor (and nylon hose), intake air temp sensor, coolant temp sensor, O2 sensor, fuel pressure regulator, check for good strong spark, and then perhaps the fuel pump (has the fuel filter been replaced recently?).
-Ryan
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Athens, Ohio 1987 245 DL 314k, Dog-mobile 1990 245 DL 134k M47, E-codes, GT Sway Bars 1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars Buckeye Volvo Club
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