This is a 2.6 right?
Any warning lights staying lit for too long?
Maybe you should try the "resistor mod". (Some cars love the mod, some don't, mine did.) http://www.peachparts.com/shopforum/showthread.php?t=32224

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89 300E "Benzer1" 15.924 Uncorrected
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95 E420 "Benzer4"
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87 300D "Benzer8"
87 300D "Benzer9"
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87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.