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heres my issue:
with normal driving, the car drives fine and acts normal. but under heavy throttle, the car has much less than average power.
the first 1/4 throttle feels normal and has pep but 1/2 throttle has the same power as full throttle. (i can hear the throttle body opening and getting louder but there is not a power difference).
4th gear only has enough power to take it to 4k rpms. and in 6th gear, the car wont do over 90mph, when 100mph was a breeze last week.
while driving it i can hear a decently loud hissing sound like air getting sucked into an intake whenever i go by a building or something for the soudn to reflect back off of. Under the hood with the car running.. pumping the throttle manually, i can hear air sucking in right on top of the motor at the intake manifold.
so i was thinking that maybe the intake manifold gasket is bad and it is sucking air through that when the motor really starts pulling air in hard (like heavy acceleration and high rpms) and the mafs isnt reading the air going in so it isnt adding any fuel....
but this doesnt quite make sense because i would expect the car to run like poop if the mafs isnt reading the air going into the motor.... so maybe i have a vacuum leak? but im not really sure how to check it or where to start looking for it. help please lol.
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