Driving with the Check Engine light on can turn a minor problem into an expensive one. The Engine Computer detected a problem, set a diagnostic fault code, and turned the light on to tell you.
The shaking is due to a misfire, and depending on the cause, it could be sending raw unburned fuel into the exhaust system. That will overheat the catalytic converter and melt the catalyst which will restrict the exhaust flow. The cause could be as simple as worn spark plugs but if you keep driving it like that the result could cost hundreds of dollars for a new catalytic converter.
Many auto parts stores will read the fault codes for you for free but Chrysler makes it real easy to do yourself. Cycle the ignition switch from "off" to "run" three times within five seconds without cranking the engine, then watch the numbers show up in the odometer display. Holler back with those numbers.
How do you know the MAP sensor is failing, and if it is, why have you ignored it? That sensor has the biggest say in how much fuel goes into the engine. Failure is rare but when they do fail they typically go from "good" to "bad" with nothing in between. Sometimes you can force the engine to run for as much as one day before the total failure results in a no-start condition.
Friday, June 28th, 2013 AT 1:51 PM