I have a 86 GL with the ea82 non-turbo. I found coolant sitting in the recessed area where the spark plug is on both sides of the engine. I have to put in a "little coolant every couple of weeks. the car has 160,000 miles on it and i believe it has sat for a long time not running. is this the intake manifold gasket? head gasket? will my car keep running for a while till i can get the time and money to fix whatever the problem is?