Idles a little rough but when I get on it it smooths out runs great and has plenty of power but out of nowhere it will start to run rough buck and all and ill get a po300 po 302 and 303. Any suggestions as to where I should start looking into this?

Thanks

 

Bump

 

Well seeing as how those are misfire codes when's the last time it got a tune up?

 

About 4 months ago. And like I said as I am crusing along all of a sudden it will start to miss and buck real bad.

 

When you see a "random misfire" (P0300) with other single cylinder misfires, the problem is usually one thing. In this case, gotta look for a common cause.

First thing that a technician would do if you brought it into a shop would be to verify fuel pressure. Must be done with a fuel pressure gauge, which you can rent very inexpensively from many parts stores, call around for availability.

For a 98, you need to have 49 psi at idle, plus or minus 5 psi.

Yes, there are other possibilities, but you need to verify fuel pressure first.

Good luck and keep us updated!