I have a 91 300 SE. The car has recently developed an intermittent problem where the car will cough and sputter at idle. When the problem pops up acceleration is also pretty poor. I also noticed today that the oil pressure gauge only registers about 1 on the 0 to 3 scale when at idle. At speed the oil pressure gauge pegs at 3. I have already replaced the OVP relay so it is not the problem. Any ideas. (Note the oil pressure problem may or may not be related to the idle problem).