Hey everyone!
I need some help with 92 Chevy Cavalier. It's the 3.1 v6 automatic in a z24 Convertible.
It's hesitating, a lot, while driving it will shake and shudder unless the throttle is most or all the way down. It gets terrible mileage, and I don't know where to start. I've only got 6 weeks to work on it before it has to make a long trip, so I hope you can help!
It doesn't throw codes, but I can't find the place to read the codes even if it did...
Please help!

mass air flow sensor? do u have a oiled air filter? try cleaning MAF with electric contact cleaner. ORRRRR egr valve stuck open, thats common too

on cold start see if egr valve get hot fairly quickly