You will have to have the onboard self-diagnostics monitored. If you really feal up to it I can tell you how to read the codes on your car with a logic probe or led. 1994 is the last year impulse counting was used except for a few systems.

As long as the system has that level of code it will stay in the "limp home" mode, which limits throttle range and backs off ignition timing.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician