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I'm sorry to inform you that those cars have alot of issues. If you could be more specific, it would help. Does it stall & shut off while you are driving at high speeds? What about just going across town at 35mph or so? Does going up hill have anything to do with it or duration of running time? What exactly do you mean by high speeds? 55-65mph or like 95 mph for prolonged periods? Do you notice your engine or transmission heating up at all?
Warped brake rotor usually cause high vibration at high speeds. But you can also feel it at lower speeds. But bad ball joints and tie rod end will cause vibration at high speeds. Ball joints will pop at pot holes, sometimes. Tie rods can be felt in the steering wheel at a stop. Move the wheel slightly to the left and right, you can feel/hear a tap as you turn it.
First off define "High" Speeds. Some models were equipped with throttle governors and or rpm limiters that prevented over revving and also kept the vehicle from exceeding certain speeds. Other than that, there are some auto stores that offer free computer scans that may be able to diagnose your problem.
The PCM is programed for the LS engine parameters and now that you have changed engines the signal from the new engine are out of parameters> Either see if you can get the PCM reprogrammed at a dealership or purchase a new PCM and program the chip with the police engine interceptor to the vehicle> you may also return to the place where you got the engine and purchase the PCM for the police vehicle.
Not true that GM dealer is the only one that can fix it . There are other independent repair shops that can, Transmission repair shops like AAMCO . You could too if you had access to a scan tool that can read DTC'S - diagnostic trouble codes for the 4X4 system . There is a 4X4 control module that can store DTC'S when problems happen . When a warning like check 4 Wheel Drive light's up ,it's not meant for you to do anything except take it to the dealer ,well ,that's what the dealer would like .
Would need to know which 4X4 transfer case your's has ? Two speed manual , two speed selectable , two speed automatic ?
Their are a few different one's
Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)
Two speed Automatic system can set a number of codes
DTC B0768 Service Indicator Circuit High
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0357 Park Switch Circuit High
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
Without having this info you could go round an round an never find the problem .
check your injectors.use a ohm meter and check resistance. 1987 maxima reading is somewhere between 10.1-14.2 ohms. if out of spec, replace. Also check your air flow meter and air box, make sure its all clean in there. good luck. post results.