Hi, I have a 2003 S2000. The car runs good, but sometimes when I am pulling out the car will be very low on power and not want to rev any higher. It don't want to accelerate when it does this. And it only does it at low rpm and most of the time in 1st gear when pulling out from a dead stop. Sometime the S2000 does it when I am letting it idle pull itself and then start to give it some throttle. I would love to know what the problem is. I cleaned the IACV, installed new plugs. Could the MAP sensor do this?

 

Might be a bad spot in the TPS. I had a similar problem with mine and I just replaced my throttle body (along with offending TPS) and all is well again. I recommend the Big Bore throttle body as a replacement as in my signature. Worked for me. HTH

 

Mine started doing something similar just after I changed the gas. Can't wait to go through this tank...