My check engine light is on in my 2004 mercury monterey?

[mactomswife]

it came on shortly after an oil change, i took it back and they claim it was nothing on their end. about 500 miles later it went off, another 500 miles and it came back on...now, i could be driving at a steady speed for 10 minutes and i feel a hesitation! What is going on??? I don't have the money to run all kinds of tests, yet I still have a loan left to pay for, so I don't need a car that doesn't work!! Any suggestions??

[max f]

check to see if your gas cap is staying tight or go to an auto parts store have them scan it for you see what they say

[TyMichael08]

take it to the shop

[Bandit]

Take it to Autozone and have them run the diagnostic codes. It's free and they also have free troubleshooting and DIY information. Somehow, I feel that it's one of the sensors. If you find the bad one, you can replace it yourself.

[Will S]

Running all kinds of tests will run around a hundred dollars. I would suggest taking the vehicle to a reputable repair facility and paying the diagnostic fee. There are alot of vehicles that come into my shop where the owner still owes money and they pay the diag fee.