1999 GMC Safari Questions

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Since this is a common problem has anyone fabricated or made available a handle that is stronger?
Initially when Engine rest in d night it will not start on time the next day. Now water is found in engine oil and no traces of leakages in the radiator. Now engine rolls and not start. Oil & fuel filters changed.
code P0440 evaporitive fule system do I have a blocked line a bad canister or a bad purge selonoid ? can I fix or do I need a Mechanic?
i replaced the battery 3 times, replaced the alternator 3 times install a new battery cable (positive)replaced the starter, replaced the the alternator plug and check all the fuse in the fuse boxes under the dash and ...
Has a 4.3 liter with steel heads and block,I replaced the head gaskets and had the heads machined,it ran fine for an hour and a half then it overheated,a shop said it either had warped heads or a cracked block.I think...
While driving down the freeway it died and wouldnt start again, i tried to turn the motor over with a breaker bar and socket but it wouldnt move at all. Trans was just rebuilt i thought there may be something with that.
Dealer replaced catalytic converter on Aug 18, 2011. Picked up vehicle on Aug 19, 2011 and drove it from that date till Sept 11, 2011 when the no start problem occured.
Whar does this code mean?
I CHANGE FUEL PRESURE REGULATOR AND ENGINE IS NOW BACK FIRING AND KNOCKS ALMOST SOUND LIKE SOMETHING FELL INTO CYLINDER BUT ALREADY CHECK AND NO MISSING SCREW OR TOOLS.
When Van is moving the Interior lights blink because of some electrical short somewhere. I can hear it somewhere under the steering wheel column.
anti- lock light is on.
THE CHECK ENGINE LIGHT CAME BACK ON AFTER BEING CHECKED IN LOW TEMPERTURES OF GEORGIA THIS PAST CHRISTMAS.
Since the last time when I filled up the gasoline tank the gage is allways on the full side even when the switch is off. Any help?
1- When the front a/c is working the compresor (clutch) its ON and OFF and blow worm air. 2- When the front and rear are ON the compresor run OK and cool air its blow for all vents. 3- When run FRONT and REAR the...