My car's started running rough?

Question

My honda civic does need an oil change, about 4,000 since last one, but past two days has been starting slightly rough and when change to park and reverse sounds rougher. Is this an air filter, oil, or transmission fluid thing? I just drove about 1.200 miles in one go, so I wouldn't be surprised if an oil change would fix it. Also noticed a bit of corrosion on battery terminals, how important is that?

Answer 1

1..except for protecting an engine from burning up oil has no effect on running

2.check ALL fluids every other week or 1000 miles

3 check engine lite on? get free scan at advance,autozone,o'reillys4..what year,how many miles,ever been tuned??? none of what u name will affect idle