I went out the other nite, and my friend in his 99' Accord V6 went to pass me, and we were on a really secluded road so i figgured "wut the heck, i'll give him a run" but surprisingly, when i mashed it, he kept up almost the whole way. I noticed that once my RPMs go over about 4500, u dont really feel very much acceleration, and it kinda dies... is that normal? or do I need a tune-up or something?