2001 Saturn SL2 My Saturn will not stay running

I live in Dillingham, AK, a bush town (air & sea access only) with no trained Saturn mechanic. I've come to a dead end in fixing this car.

The car is a 2001 Saturn S-Series with a 1.9L Engine and Standard Transmission. I purchased this car this past summer and it ran well except for an occasional high idle. This past October it suddenly (no warning signs) quit running. It will sometimes start, rev up high, then rpm goes down (no matter what you do with the throttle), and the engine dies.

I hooked up a Snap-On Scanner and got the following codes:

P0300 Misfire

P0341 CMP Sensor Circuit out of Range

P0507 Idle Control Syst. (RPM too High)

P0562 Syst. Voltage Low

P1599 CC Power Management Mode or Engine Stall

My scanner says the CMP Sensor is a Camshaft Position Sensor, which looking over the list of codes, I thought to be the likely problem. I called a Saturn dealership parts man (and Napa) told me that this vehicle doesn�t have a cam sensor, and that the CMP is the crank sensor. So I replaced the crank sensor, cleared the codes, and no change, the engine will only rev high and die.

Current codes are as follows:

P1599 (see above) Scanner code tips says:

P1599 sets when PCM detects engine stall or near stall condition with ignition still activated. If other DTCs are set with 1599, repair other DTCs first.

P1599 does not light warning. P1599 can be set during operation with manual transmission vehicles. 1599 sets when key is on and no CKP signal detected by PCM (engine stalled); 1599 may also set by intermittent fuel pump failure, sticking open EGR or intermittent ignition failure.

Note: I hear the fuel pump running, but haven�t checked further.

The only thing I know to do is to change the fuel pump, but parts/shipping here is 50% more than the L48 and I hate to keep throwing money at something without thinking that it will likely fix the problem.