89 S10???

Just got 89 S10 with 4.3L with 153xxxkms. Couple of questions. The motor is bogging and feels weird. Is there some common places or weak points that are known for problems. FEELS like its runnin low oil or old oil. Was there a problem with the oil pump at all??? Dipstick level is perfect. Only had it a week so I havent had enough time yet to do anything. I got a 7 mo warranty so I'll prob take it in to see. Engine also races at idle from time to time. Wires look new so plugs are prob same too. Don't know these engines so excuse the ignorance. Sorry for the long post.