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Your fuse panel is nice, new fuses, all contacts clean? Your wiring harness is new? or resembles swiss cheese? You say the relay is dead, yet the plugs are fouled? The plugs have to have been fouled before the relay was dead. You have to have spark before you have fuel. You could very much have more than one problem. The ignition signal is sent to the fuel injection relay. Your relay contains both the "system" relay, and the "fuel pump" relay...it's basically two relays in one. The relay also has an eletrical circuit in it that provides the ground to the fuel pump relay section when the ignition signal is delivered. This ground then turns on the fuel pump relay portion, which will then supply current from the fuse to the pumps. You either have another dead fuel pump relay, or you have lost spark. Check for spark at the coil. Check to be sure the ground at the windshield washer bracket is secure. Check all connectors at the distributor, the coil, and the connectors directly under the wiper motor in the passenger side of the engine compartment. Then recheck for spark.
Backfiring is usually related to the timing being off, your distributor has a weak link in the form of a star wheel lock pin, they will sometimes break and then the star wheel will kinda find it's own way, slipping around the shaft and then the timing will be off. The marks on the belt will be dead on, but the timing will be off. The replacement pin is better. You can also have a loose sleeve in the star wheel...same problem. The coil will spark at a time when the rotor isn't aligned with the cap electrodes. But this is of course when the car is running badly, not when it is not running at all.
There aren't too many components in the ignition system...the switch, the computer, the distributor, and the coil. I guess we can discuss how to check each if playing with the fuse box, grounds, and connectors doesn't solve the spark dilemma (if you have a spark dilemma and not a dead relay).
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