Hi i have an 84 22r 4x4 that had the head gaskett and timing done about 3k ago and a tune up about 100miles ago and the other day it died on me as i was picking up speed in second and wouldn't start again so i towed it home changed the coil it started and went three blocks and died again so i towed it back and changed the fule filter, coil, ignighter, shot eather in the carb, checked the timing several times, and when i checked under the cap the button was seased so i changed the cap again and it started went 4 blocks and died again but it back fired this time and wont start at all any ideas?

A sensor probably starting to fail . Having a compleat diagnostic scan of the vehicle by a qualified technician should be done .
064 Emission Tests Scan Data Pre Check
003 Engine Peformance Tests Scan Data Tests

What year and what engine?

I have 94 s 10..4.3 v6. it does the same thing have replaced fuel pump and filter,ignition module,cap rotor plugs wires,coil,ground strap...driving down the road jus dies like the key got shut off....for a while when troubleshooting through the parts you could get it to restart.....now when it dies it cranks really hard when trying to restart..ive checked the timeing its fine....if i wait a few min it will usually start...sometimes it will show a check engine light sometimes not......never know when it will happen sometimes jus down the the road from the house sometimes 100miles down the road......sometimes three times in a mile sometimes not for weeks at a time..Wtf...Im ready to shoot it like a lame horse....its a shame too its a sharp lil truck thats a two owner and never spent a night outside in its life...i knew the original owner ...i bought it with 90,000 on it it only has 148,000 now and still looks like new...

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ok not to hard to replace you need to go to auto store and buy a new one. it may or may not come with new gaskett they can tell you what size you need if it dosent come with a new one. also you will need to drain the oil before removing the old pan so make sure to buy new oil for that.. your basicly doing an oil change so you may as well get new oil filter too. then after you have everything... new pan, oil, oil filter, gaskett.. just get under take out oil plugg drain oil in catch can. remove the oil pan bolts you may have too tap the oil pan in different directions to get it to drop off. clean away old gaskett if you need to, and replace new gaskett and oil pan, lay new gaskett ontop of new oil pan and hold in place to get a couple bolts started then start and tighten all bolts useing a cross bolt tightining pattern to make sure the pan is in place{ tighten one bolt then do opposit bolt} change oil filter, and refill with oil.. if you need to see this done youtube is an excillent place to find videos on this.. i hope this helps... remember to let the car cool before doing this so get everything you need and start the next day before you drive.. nothing worse that getting hot oil down you arm while your laying on the ground...

COULD OF BLOWN A HEAD GASKETT

If your backfiring most likely the timing is off. I would pull the cam cover and make sure all the timing marks are lining up when it is in Top Dead Center (TDC) Also on the older Toyota's there is a plug in the harness on the drivers side that has to be jumpered in order to set the timing correctly.

Your transmission should be in neutral when shift from 4x4 low to high. Also the brake needs to be depressed. If you have done that I would say it is a solenoid in the transfer case or the relay that drives the transfer case solenoid.

check too see if fuel filter is pluged first.

I think your problem might be your fuel relay which is situated next to the fuse box in the engine compartment.