Hows it going, Im 21 years old, and so is my 305 RS TBI. I've been in the dark on trying to fix a problem, and if you take the time to read this i would greatly appreciate it. My car has been running like a POS losing all compression when its warm and I try to accelerate or go uphill. It will backfire, hesitate, and then just lose all power causing me to let off the gas until it regains stability of fuel/spark. I say fuel or spark because i don't know which one it is. I have put in new spark plugs/wires (in correct firing order), distributor cap/rotor, fuel filter, and other things. I HAVE NOT REPLACED the O2 sensor, the EGR valve, either of the 2 fuel injectors, or the fuel pressure regulator since Ive had the car which has been almost 6 years now (current mileage is 121 K). I bought the haynes manual for a complete engine tear down/rebuild for my car and in it lists all diagnostic symptoms, causes, and etc. In that it has the ignition timing listed as a cause for all the symptoms im having but it also lists the fuel elements. I haven't had the timing adjusted so I was hoping that is my issue. My uncle and a couple other people think it could be the throttle body, the fuel regulator, or one of the 2 injectors. The service engine light DOES NOT come on and I don't know if the injectors or regulator would make it if faulty. Also, "it" is worse when it is hot. When it is a cool 50 degrees outside it wouldn't act up, only rarely, but the heat is making it worse it seems like. If you are still reading this my main question is do you think the timing is the problem, the fuel components, or something as simple as an o2 sensor? I don't know if the O2 Sensor would pull a code, and I am NOT getting the service light on at all, which does work. Timing? Fuel Injectors? Fuel pressure regulator? or the throttle body itself? Which do you think? I really would like to hear from another 3rd gen owner. Thanks

 

How old is the coil? When they start to fail they cause the same problems you listed. Also check the wires on the coil and distributor icm and make sure they are good and connected. Good luck!

 

new distributor coil, cap, rotor, new plugs and wires....everything spark wise is new and should be fine but my timing could be off, it has to be that or the fuel delivery, I can't see what else it would be

 

Any luck? I have the same problem!

 

HI check vacume pipes for splits or perrished mine did same split pipe changed it .fixed that problem .changed them all !