no i didn't change the coil plug resistor extensions. i'll try that tomorrow. i also put in platinum 2 plugs. the book say's the application's fine but i'm reading that they could cause ignition problems. is that with 2000 230 also? thanks for the response. it's also been suggested that my ECM is bad. does this seem possible? car ran well yesterday but temps were above 40. this morning the vibration was back and temps were well below freezing. wondering if MAS is bad again. 20,000 miles is a pretty short life span for a $430 part. dealer ripped me good also charged $340 to install. cleaned air filter pasages and put in new filter. joe d