4A-GE MK1 Engine valve cover pressure?? [Archive] - Toyota MR2 Message Board

4A-GE MK1 Engine, pressure, valve, dosent, clogged, years, remember, thinking, system, coolant, problem, tested, fine, ideas, overheating, slight, sense, changed, water, thermo, pump, make, idle, unused, yearsoccassionally, driven, miles, cover, 148,000, daily, sounds, engine, speed, slightly, sound, vacuumor, running, remove, filler, owned

I have an 88 with 148,000 miles. car has sat mostly unused for 5 years(occassionally driven, not daily car) when car is running, and I remove the oil filler cap, I get a vacuum(or pressure) like sound, engine sounds different, Idle speed changes slightly. I