I noticed my 94 LX 4 cylinder seems quite a bit *louder* from about 25mph up to 60. This is weird because I don't have any mods done at all. It's a stock Accord muffler and exhaust.

Also, when I was driving today it took a lot of effort to get the engine to increase in speed from 60 to 65. It was like the transmission didn't want to shift.

So the question is, what could be causing more engine noise that's directly proportionate to throttle (ie... very quiet at idle, but loud above about 20mph) and a slow throttle response? Thanks...