1999 plymouth neon cuts off when driving no engine light comes on

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.

No Engine I know of has a 1,2,3,4, fitting I am sure you have the firing order connected wrong, plus your description point to the firing order as well. Cheers, Malcolm Campbell.

have the vehicle scanned for check engine code most auto stores offer service for free

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.

try starting it in neutral

Check engine light comes on and remains steady, if there is error code stored in your cars computer.You need to get your car scanned.For more details, lick the link below:--- http://technoanswers.blogspot.com/2011/10/check-service-engine-light-on-1999.html ---------- This will help.Thanks.Helpmech.

if you don`t want to by one at a store you can go to the library and see if they have one you can use

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.