i purchased this car used. it was good for 6 months then the problem began. it stops when you're at red lights. will not stay running. chugs when it gets hot on the interstate. it is a real pain. have replaced all oxygen sensors. have replaced throttle body and still the problem is there. tired of spending money replacing parts that don't fix the problem.

My car chugs back and forth when I'm stopped at light or whatever and I have to step on the brake and barely push the gas to raise my rpms and it stops. My vacuum pump also looks to be dry rotted if that could be the problem..if so how much is that and how hard is it to do yourself without taking it to a professional.