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According to my source, code 1899 is a problem with the governor pressure sensor. But 4 digit codes are model specific, so you may be right about the selector switch. If the switch tests out to be faulty, it would need to be replaced and the code erased.
I can't see the car or know the complete history, but with that many miles it would need to be way below book value. The car overall was designed to last about 150k in my opinion. If the check engine light is not on, there may be something broken in the transmission to keep it from shifting into overdrive. If the check engine light is on the code could point you in the direction of a solenoid or other electrical part. I would not buy it unless you are prepared to spend the money to replace the trans.
Check Cylinder pressure. PO302 is a cylinder misfire code. you have 4 cylinders in your car. You need to find out whats causing the misfire, could be something simple as changing sparkplugs... could be something a bit more advanced like changing rocker/lifter arm.. It's not something that you would want to drive around with for a while, it could mess more up than it would cost to fix right now.
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon) 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.
If your check engine light is coming on, then there should be a trouble code stored in your computer to tell you what area to look in for problem. Run into an autozone, or Pep Boys & get a free scan and see what they say comes up for codes & then if not obvious what the problem is, get back to us & we'll help you out.
Get those new codes, sure sounds like a MAF issue, also I have run across engine movement stalls, they turned out to be a break indside the engine harness, when the engine moved it would break the connection and stall or run really bad, I found these kinds of problems by pulling and twisting the harness to the engine, then I would cut it open and do the same thing wire by wire.