I have 1994 Pontiac Grand Am with 2.3 liter OHC engine.
My car has the following problem. When I drive it suddenly looses power.
I'm pushing accelerator pedal and engine does not react at it. Sometimes
it reacts but the car stars jerking. Sometimes the car reacts normally. It
can happen when the car is hot, warm, at high speed, at low speed etc.
I also noticed that sometimes engine temperature is higher than usually.
At these times the car has the most significant loss of power.
Sometimes (when there is a lack of power) I can fell sudden power increase
like something pushed my car from behind.
And one more wierd thing I noticed is when I try to accelerate and there
is no power I can hear a sound that resembles the sound of compressed air
coming out (psss, psss, psss).
The engine is idling well.
Does anybody have any idea what it could be ?