Just after getting an oil change yesterday my van started to ride VERY rough. It had problems with acceleration. This morning the service engine soon light came on. I took it back to the place who did the oil change and they ran a diagnostic and the code came back 1133. Can you tell me what needs to be done next?

First check transmission dip stick for correct fluid level. Next schedule a transmission filter change. This should have been done at 60,000miles

need to first make sure your using the specified by dealer oil.in your oil changes. also filter cause the after market breaks and Dubree like that causes these problems.

This is all tied to the service engine soon light.

When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

make sure you have oil engine .

Your description sounds like maybe a tranny problem. Make sure the tranny fuid is fresh. Otherwise you need to have the "check engine" notice checked. Some oil change places will check it for free. Or you can buy a OBD II scanner/reader and get the detail of your problem.

Not sure what year you have?? Could have a bad coil or wires to coil. Check at night in dark place for coil arcing to ground,look for flash when revving engine.

If the service light is on in your TrailBlazer, open the door, turn the key to ignition position and push the accelerator pedal 5 times, the service light will flash. flash your high beams and you're done.

sounds like a large vacuum hose was knocked off the engine when they pulled the trans out, have that checked.

I have the same problem, I replaced the fuel pump. Did NOT solve it. i was told that it is a computer problem. The computer is not sending electric to the fuel pump, by cranking it several times the oil pressure builds up and will over ride the computer and send power to the fuel pump. This is a common problem on these asrto vans.