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Wouldn't rear axle length affect the front tire scuffing, when cornering?

Statement is true.

No charge. Delivered by Christmas.

I have some of these (license plate). Let me know if you want one. PM your address.

Not sure if this could help, but Volvo used a suppression capacitor for radio interference. No help with capacitor value (Farad). ICM_EARLY RENIX VOLVO_2.pdf

OUCH!

86 ECU looks for WOT switch input. 89 harness connect to a Power Steering Pressure Switch for same input. This is a difference. Not sure if it would cause your issues.

I believe both BRAKE & COOLANT are "Bulb Check" bulbs. Meaning both should illuminate during ENGINE START when KEY is in the CRANK position. Purpose is to make sure both bulbs test GOOD prior to every drive cycle.

Other photo showed elbow at manifold connection. Looks correct in latest photo. Taken from RELEARN procedure: The following general procedures are to be used if drivability problems are encountered after power loss or battery has been disconnected. These procedures may provide an aid in eliminating these problems. 88 FSM Computer Relearn Procedures.pdf

Make sure that additional hose (Fuel Pressure Regulator (FPR)) is connected at the intake manifold. Can't tell by photo. Idle may get better with time (RELEARN) after all your fixes. May need time here (drive cycles) to see if things improve.

Thinking maybe metal and heat related. 2¢

This shows the general area where the vacuum hose goes. That broken tab (green) can/will cause problem later on. Take note.

You ain't going anywhere with that MAP sensor hose disconnected. Should connect up at the base of TB. Look for the other missing end. What's that green thing laying on the heat shield?

RED wire with single connector, if HOT AT ALL TIMES, is used for Engine Compartment Lamp, when equipped. Two YEL wires could be Resistor Pack for Automatic Transmission. Relay Block with Two PNK wires is/was B+Latch Relay.

Swap your relays around with one another. See if different trouble follows the relays. Splice_A (Engine Harness) is common point for all four (4) circuits (FP motor, Ballast Resistor, O2 relay and Starter relay). One of your Ballast Resistor wires will lead you to this splice, the other wire back to the other side of vehicle.

The ECU controls the FP relay at KEY ON and ENGINE RUNNING. This is the source for B+ to Ballast Resistor to Fuel Pump motor. When ECU see NO start signal (KEY ON only) at C201_C3 (Starter (+)) circuit, ECU will time out and shut FP relay OFF (prime cycle).

Three conditions feed (B+) to the fuel pump motor. One (1) using the ballast resistor and two (2) bypassing the ballast resistor. Conditions are as follows: 1. During CRANK. B+ is supplied by the Starter Relay. Ballast resistor is bypassed. 2. During WOT. ECU knows when vehicle is in WOT and activates the 02 Heater Relay. Ballast resistor is bypassed. 3. At all other times, Fuel Pump Relay supplies B+ using the Ballast resistor in series with the fuel pump motor circuit.

Part# J536 0059

Is he missing the sleeve and spacer(s)?

True. It's for the Cargo Box Lamp, if equipped.

Find this posting further up this page. Try downloading that.

BLK should find chassis GND thru G102 at all times. BLK/WHT should find GND thru door jamb switches with open door(s) or when headlamp switch is set for interior lights ON.