Need help on possible wiring issues

[4g6387]

Alright first thing first. The car is a 92 240sx with a ka24de. I have just done a head gasket and the timing chains with tensioners and guides. Just have gotten the motor back in the car in the past few weeks and have been having issues getting it to run and idle. I have since rechecked cam timing at least 4 times and it is dead on. Have also checked and rechecked ignition timing and it is dead on as well. Spark seemed a little weak so I have also done another new set of plugs, with wires and the ignition coil. I can get the car to run, with the MAF unplugged and hold it at about 2000rpm and the motor runs just as smooth as it can, but as soon as I left off the gas it dies. With the MAF plugged in the car wont even start. Secondly when the car does run it is very rich in fuel mixture. Almost like an ECT problem would create. However no codes are being set through the computer so no obvious smack in the face thing to fix. So I pulled out the trusty ohm meter and started taking some measurements on things fuel delivery related and was highly shocked at 2 results in particular. I'm hoping maybe someone could check the resistance on these 2 items in their own vehicle and give me some kind of cross reference. But I checked resistance of the ECT and at operating temp was 2.2ohms which would seem normal. Then I checked the resistance on the harness side and got 1,290ohms. Yes 1,290. Now to me that seems very high on a small 2 wire system. Then for s*** and giggles I checked the MAF wiring as well on the 2 right hand prongs if you are looking into the plug and got a reading of 830ohms. Both of these seem excessively high to me but again I have nothing to cross reference with and Alldata at work only gives me a voltage reading for while the car is running and everything plugged in.

So to anyone that believes they can help with this bit of knowledge and hopefully help me get this car back running your input is much appreciated and wanted. And thank you in advance.

Also small added piece of info, this is the second time the head gasket and timing job was done. The first time ended in bent valves. Timing had been set perfect, but somehow the cam gear bolts had been overlooked and were left loose. When the car was started then it ran perfectly until the intake came gear came off. All of the running issues have started since the motor was pulled to do the timing job the second time and then put back in. And yes compression has been checked this time around for fear of more bent valves than I had seen and readings ranged from 150 to 160 so I know the engine is sealed up good.