slight vibration at 3+ rpm's ?

[98integra]

i just bought my car (98LS 90k miles) and it drives fine except for when i rev past 3 RPM's .. their is a slight vibration on the gas pedal, it isnt very noticible so maybe im just parrinoid .. does anyone know if a oil change will solve this problem the dealer said it had the oil changed when i bougt it so im probally at 2000 miles since changed but it has been doing this since i bought it.

[98integra]

if a oil change doesnt work will a tune up fix the problem ?