So I have no idea what my car is doing at this point. I bought the car and replaced the flexplate and it ran good for a while. then it died while i was going 65 down the highway and had no codes. so I replaced the distributor cap/rotor, spark plugs, s.p. wires, air filter, fuel filter, fuel pump, fuel vapor canister, injectors, throttle position sensor, cat back exhaust and a throttle body rebuild.(ive also timed it) basically I idle fine and can rev all I want with no problems or anything. but when im accelerating at random (seeming points) a check engine light will come on for a split second and the rpms will drop a bit then go back. I try getting the codes but it doesnt bring any trouble codes up. my car also whistles from the intake when I push the gas. any help or ideas are appreciated, so thank you in advance.

 

since no one answered yet, could it be a bad ecm? what are some things that go bad from a faulty ecm? or could it be some random sensors? basically idle is fine, i put the car in drive and it goes fine, i push the gas about half way and before it shifts it hesitates and drops down in rpms. then it shifts and is good for a few seconds then drops goes drops goes and so on until i stop pushing the gas then it rolls and idels fine but keeps droping rpms for a split second every three seconds or so. (sorry for spelling issues) and ANY ideas or questions please post. thank you again.