These 'shortstar' engines are well known for low oil pressure at idle, so look first to be sure it is full on the dipstick-it takes about 7 quarts to be full. If you are using 5w-30 oil (recommended), consider changing the oil and refilling with 10w-40, and buy a good filter like purolator Pure One, or a K&N, Wix or Delco. If theis happens even when cold, you have a problem that will be a lot more expensive-oil pump is going or gone, or you have worn bearings and this is going to require a rebuild of a used engine, very expensive.
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