Hi all. I own a 04’ Jeep Wrangler and the gas mileage has taken a sudden drop. It was running around 17mpg but over a couple of months dropped to now about 9mpg. The check engine light only came on intermittently and when I took it to autozone they said the TPS (throttle positioning sensor) needed to be replaced and should fix my gas mileage problem. But since being replaced it has not made a difference.
The car seems to be running fine except once in a blue moon it will die on me without warning. Besides that it shows no other signs that it is damaged. Any suggestions on what the problem is or how to fix it?