Corrosion/moisture at the throttle position sensor can cause performance issues relating to low boost.
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Repairpal verified 1990 Porsche 944 problems
Automatic transmissions can leak internally and cause the automatic transmission fluid (ATF) to mix with the differential oil. An overfilled differential and/or a low fluid level in the ATF reservoir is symptomatic of this. If not repaired immediately, the transmission will fail; the pinion seals will also need replacement.
The release arm for the throw out bearing can bind and cause problems with the clutch. Flywheel wear can cause driving and shifting problems and may cause the hubs to fail.
The front hood and rear deck lid support struts may fail; replacement is required.