Engine is missing can you help me?

I have a 98 neon 2.0 I hooked up a code scanner and I keep getting a number 4 cyl misfire code I replaced the plugs, wires, the coil checked good, some one told me that maybe the crank sensor was bad if so how would u check that if now what now?

Electrical problem
1998 Dodge Neon 4 cyl Two Wheel Drive Manual

I keep getting a multi missfire (Generic) and OL-Fault Fuel sys-1 after driving on the highway for about 5-10 minutes. Ive also had the temp guage go crazy and spike all the way up and then go right back down. I might try to check the connection at the temp sender and/or replace it I was told that if the temp is not being read correctly it might give the engine the wrong info for fuel curves and that when the PCM gets a multi missfire code it puts the car in a limp in mode which might set the temp at a specific number even if its really reading wrong. Ive run the OBD scanner while driving and the temp stays at 199 Deg when the OL-Fault occurs and it reads multi missfire. Any ideas on where to start would be appriciated. The engine in a rebuilt with a Pacesetter header, MSD coil, flowmaster exhaust, and the Mopar EGR block Plate, (the EGR is still connected and to the best of my knowledge it does not send any data to the OBD). It has a new fuel pump and new plug wires and Ive tried 3 diff type plugs. Also while at highway speed and when the code is given the engine still runs great no hestitation or rough acceleration. Im also getting a bit of carbon at the exhaust tip like its running rich. Could this be a bad up stream or down O2 sensor? Or is it the EGR being blocked. Also im thinking of getting the Mopar PCM only because it a little cheaper than the AFX and its a bit more mild on the changes. I do know that it disregards the EGR and downstream o2 reading. Dont know if that would help with the ol fault/ missfire or not. Im just hoping that someone has had the same issue and can guide me in the right direction. Thanks for any help.

Im going to add my OBD scan info so far Ive seen just,

P0300 Multi Missfire
OL- Fault Fuel Sys 1

The freeze frame at the DTC is:
P0300
Fuel Sys 1 CL
Load 21.18%
Engtemp 143.60 Def (F) (Low or Wrong temp?)
STFT B1 -3.13% (Trying to compensate?)
LTFT B1 12.50%
MAP 12.70 InHg
RPM 3072
Speed 67.11 MPH

Car has a cylinder misfire. Was originally cylinder three. Replaced spark plugs, wires and replaced coil pack with a known working coil pack with no change. Other then cylinder three misfire has moved to cylinder two. I do not understand why cylinder three went away and now it is cylinder two. Tested compression and all four cylinders are 190 PSI. Thought maybe the timing belt stretched a tooth. Took pictures but it looks like it is in time but I could be wrong. Does not have a misfire in fourth gear. Only in fifth gear and it starts when you get to forty five to fifty mph.

Yea, I sprayed intake cleaner around the intake and it does not change the rpm's.

Yea, I swapped the coil from my Neon to my mother’s Neon and her Neon drives with no problems. I will swap the coil and plug wires from her Neon to mine and see what happens.

2.0L dohc engine bored out.20 over, steel sleeved, Je pistons, Crane.012 cams, Extrude honed intake, Walboro fuel pump, Fidanza adjustable timing gears, stock fuel injectors, stock computer. For some reason the car only runs on three cylinders but has spark in all four and fuel in all four, my question is, is it the computer or a wiring problem or a timing issue?

Compression is good, fuel may be bad, it's been in tank for 3 months, injector, I've replaced with another injector and egr valve is new, wires are new and spark plug is made of pure silver.

Car chugs when at idle, also when gas pedal depressed, why? Highway speeds the car runs perfect. When it chugs the check engine light flashes.

Engine Performance problem
1996 Dodge Neon 4 cyl Front Wheel Drive Automatic

I have put new plug and wires on the car but when you first start the car and start down the road it will misfire for a little bit then it just goes away it is just when you first start the car could this be the electronic ignition there is no check engine light on

I have a cylinder 1 and 3 misfire and i've replaced the spark plugs, wires, coil pack, and valve cover gaskets. When I drive the car white smoke comes out of the exhaust pipe and when I slow down or stop the car shuts off.