hey guys, recently purchased 93 hard body, with the 3.0L engine. couple things, at idle it sometimes is missing and spitting making seem as though it runs rough, but as soon as i get over 2000rpm it smoothes out. also sometimes when im driving i get a severe vibration right under my feet on the drivers side, then it does away, im wondering if anyone else has encountered these problems and how i should go about it. any other tips on making this truck better would be much appreciated as well!