My car wont go over 4500 rpm when i give it a lot of gas, it just sputters and just wont go any further. But if i gradually give it gas it will go past. What could this be?

 

Could be any number of causes, need more details about the car/engine/year. Turbo/NA, mileage, mods, etc.. Does it start easily and idle smoothly, are the air pump/cats present, maintinance history, has it been overheated, yada, yada, yada..

Download the FSM from my sig line, start reading/learning about the engine, the begin comparing your engine against the diagrams to check for any mods/alterations.
.
.
.
.
.
..

 

its a 1988 rx7 vert stock motor, 120,000 miles cant say much else i just got it. I just dont know where to take it becuase not many people know how to fix it. THakns though

 

If it's taking what seems a long time for the rpms to rise, most common cause is the main cat is plugged. I had a 79 SA in the shop once that took 2 full city blocks to get the rpms up to 6k. Replaced the stock thermal reactor and OEM cats with a set of headers on a pre-silencer, car ran like a stripped assed ape. Beforeyou start on replacin exhaust parts, install a new fuel/air filter.

If you haven't downloaded the FSM yet, do so. The more you learn about your car and it's operation, the easier it will be for you to describe the problem and for us to advise you on troubleshooting and potential repairs.

 

well i just recently drove it and it doesnt currently have exhaust on it ( just the header) and it still does it. So i guess i read up on the link you provided and see what to do. Thanks old fart

 

It could simply be the 3800 RPM hesitation. Check your grounds: http://www.aaroncake.net/rx-7/grounding.htm