1995 All Other Makes

My 95 passport is idling terrible. I just had an anti-freeze leak fixed last week and starting yesterday when I start the car, it sounds like something is grinding in the engine. The grinding noise stops when the car is in gear and i'm accelerating. However, as soon as I come to a stop or begin braking, it begins again. Also, when I start up the car, the oil pressure gauge reads around 55lb/in2 with the car only in park. The oil pressure decreases to around 35lb/in2 once the car's temperature has risen.

i am worried I am burning up my engine. As I no almost nothing about the internal workings of a car, I am begging for some help with this.

thank you.
June 9, 2006.

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