I'm driving a stock 94 Dx 5 speed. last November I changed the belts, radiator, spark plugs. Just yesterday the car was running great. Now when it's idles it shakes like crazy and putts on 1st and 2nd gear. The only thing I can say is that it's due for an oil change and I might have ran the car on low oil. Whould this matter? Thanks for any help.