ude_lose

Well when i first got my 87 RX-7 N/A the guy that I bought it from told me that when the engine warms up it sometimes start running rough. But I still bought it ($800 yes it was a bet), what it did when it warmed up was like if it wanted to turn off and when put in gear and wanted to take off it would take off really slow because even with the gas pedal all the way down it would still not go like normal but really slow I would just let it sit for acouple seconds and the engine will go back to normal. I did the tune up spark plugs, cables, oil, oil filter, and air filter and I also bought a fuel injector cleaner and it did not do that anymore the car was now perfect. But just yesterday about a month of driving the car daily with no problems it started doing that again but only when it warms up and sometime if turns off or if I turn it off it has a hard time starting until it cools down for about five minutes and then it is good to go again. I checked the oil and it is full, I was wondering if it is because my straight pipe exhaust is ripped by the cat converter or if i need to change the fuel filter. Well I really have no idea why it does this someone please help me why does it do this?

1990Rx7Gtu

First off, to help me tell you whats wrong.... where did you get this car? Because I know of two people that live by me that sold theirs both for 800 bucks. And also there was problems with them both.

cbrinega

You should probably try to do some checking on the car and avoid replacing parts that "might" fix the problem. I'd start with checking the fuel injectors (could be flooding, etc), AFM, and engine codes. Your exhaust leak will not cause a hard start.

Some fuel system diagnostics:
http://www.babcox.com/editorial/us/us30232.htm