I got this truck not to long ago and it was running fine but now it idles rough and lost some power. I have no clue where to start looking so I figure you guys could help me out a lil. The truck is a 89 pickup with a four banger seating on 33, can you guys please help my noobness with this truck? Oh you really can notice the lost of power when it starts warming up.

 

All it took was a new fuel filter and some sea foam ran through the vacuum lines