my 305 tbi is still running like a dud after replacing cts, plug wires, cap, coil, rotor. I dont get it, the exhaust even sounds stupid like a dud is the best i can explain it. Just sounds like junk and out of tune bad. The car is lacking any throw you in the back of the seat power too. When i floor it dont really take off very fast, sorta takes off like a 4 banger cavalier would. What may be the problem this is making me so mad! one thing i did notice car was having trouble starting till i hit the gas the other day which leads me to think fuel problem? fuel filter?? so does anybody have any idea of what it may be? the timing? I use to be able to smoke my tires at 15 mph too. my throttle response also sucks. dont seem like car takes off unless i almost floor it.

 

Get a fuel pressure reading. Could be plugged fuel filter or weak fuel pump.

O2 sensor often causes problems.

Check the timing.

If all that checks out, could be the ignition module.

 

I agree with five7kid.

also, be sure to check the air filter and intake for any physical obstructions, clean your filter, perhaps replace the PCV filter on your air cleaner housing (passenger side, about 1 inch diameter). could be getting not enough air as well.

have you made any mods? recently?

another Q...........hows your oil pressure?

 

its my catalytic converter, clogged