My 525 model 90 is having a big problem that happened anytime that the car want to happen. that means that sometimes is going fine and sometimes the revs are going up and down, sometimes the engine switched off, sometimes big BOOM!! (like a gun) from the exhaust. I am feeling that something cut the power suddently like immidiate stop of the fuel OR SOMEONE PUT A BANANA IN THE EXHAUST OUTLEN. Like the car cannot breath! sparks and wire sparks are ok. Do u think that is the fuel pump? do u know the symptoms of a fuel pump that need to be replaced?
Any help will be extremely appreciated!

paschalis-
paschalisg@yahoo.com