jus bought a 92 EG9, had a water leak so got it cheap, put a new thermostat in it and seems to hav cured it. the car has coverd 162900 miles and was running well til the other day, i degreased the engine bay and powerwashed it, car ran fine all that morning, then got in to it later on and it started fine, after warming up to nearly the halfway mark on the water temp guage, it started to run on 3 cylinders. after a few miles it kinda cleared but wasnt 100%. then 2day when i started it from cold it ran ok, drove 4 a mile and stopped to put petrol in, when i started it again it ran on 3 again, i had 2 drive around trip of 15 miles and it was only on 3 when i knocked it off again. surely if it was damp it woulda dried out by now, starting 2 wonder if the head gasket has gone?? wot shud i check first? thers no oil in the water or vice versa, the heater still blows hot aswell. is ther any weak spots that i shud check 1st on these cars?? all comments or advice are welcome!!