I had a front left head lamp bulb replaced midmorning today.

Hey Anon, Yes, drive it to the tranny shop..plan to leave it... sounds like you are in for a rebuild.. this is typical for GM RWD transmissions.. I have seen TOO many do this same thing,, (I have had TWO in for this... vehicles I inherited that were not maintained)..GM transmissions on RWD's must have the fluid and filter changed every 50K - 75K and a complete fluid exchange and filter replacement every 120K -150K MINIMUM for them to last..usually cost around $1200 - $1400.. sorry.. Good luck!

Check that the wire to the temp sender unit has not come off and is shorting out on the head.It it is it will read as overheat on the gauge straight away

Well...my ball park guess on this is just a tune up. The engine light is usually showing a misfire. If the plugs are bad then the cylinder is not igniting the fuel and it is flooding out. With what is here this makes sense to me. Let me know what it does turn out to be.

Removal & Installation

1. Disconnect the negative battery terminal.
   

2. Remove the head lamp mounting bolts, then disconnect the lamp connectors.
   

3. Replace the head lamp bulb(A), position bulb(B) and turn signal bulbs(C).
   

   Head lamp bulb(A), position bulb(B) and turn signal bulbs(C)
   

4. To install, reverse removal procedure.
   

if there is no noticable leaks might be head gasket. Check to see if a lot of vapour comming from exaust. You may have to get a pressure test on cooling system.

Bad CV joint, very common DEFECT in GM 4wd suv. It will fall apart after awhile at anytime. DO NOT DRIVE till replaced. Had it done on a 1996 Sub. for $250.

Check the front and rear (although probably the rear) turn signal bulb socket for corrosion and/or water intrusion. If you find corrosion attempt to clean (but you will probably have to replace the socket and bulb). For water intrusion you will probably have to replace the break lamp assembly.

Head lights can be a pain at times but before jumping to conclusions... Have you taken the low beam bulbs out and checked the continuity on them...
The filaments could break and then make a short term contact causing your right lamp to come back on.
Check the bulbs with an ohms meter first before searching for more difficulties.

It might leave you stranded. Because without the alternator. which I think is your problem your battery will run down in a very short time. Even if you had a new battery.Check the belt first as Toyota Ed suggested. If it's good, and not broken. Replace the alternator and if you have to, the battery also. One could affect the other.

this engine fuel pump prassurae low. it fuel pump celan. Your problem sovel