92 cadillac runs one day then dont the next

It is a known issue

92 Deville climate control not coming on ' Cadillac Owners ...

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Jan. 10, 2013 - Hello, I have a 92 cadillac deville 4.9L In general it runs fine but recently we ran into a problem. The problem is the climate control panel ... 1992 Deville Heater/Climate Control Issues ' Cadillac Owners ...
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It may be the throttle position sensor (TPS). It is located where the intake air (from air filter) attaches to the intake manifold. The TPS connector should have 3 wires. The TPS controls the air/fuel mixture.

throttle position sensor replace it. also in rare cases the map sensor will be bad . go to a junk yard and get your replacements it wont cost near as mutch. compared to the retail stores

Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.

The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.

Check for water in gas.

When you disconnect a spark plug wire, do you get spark when you crank the engine over?
If so,
When you turn the key to the "run" position (do not crank) do you here the fuel pump run for 2 - 3 seconds?
Let me know.
Regards,

i know this sounds stupid but did you check the oil some caddys have a fuel pump shut off if the oil gets to low

Recheck the charge on the battery,make sure it's fully charged.Check all connections at the battery and at the starter.Possibly a bad starter.If the starter is ruled out,then look at the teeth on the flexplate/flywheel.I would remove the starter and test it.

I sort of had this problem with my 92 deville...u could try to pull bak a lil more on the release and push forward after that while someone else is outside the car...the person outside the car should try giving the hood a lil push n if it pops up a bit...the latch under the hood is located to the left side next to the grill.

Hi,you can run a fuel presure test to see if the fuel pump is working properly, you can also run a timing chain text ,this is a little complicated but you may be able to do it , take the distribuitor cap off,with a ratchet turn the crankshaft back and faward,if the rotor takes to long to move the chain is worn out,this can cause loss of power, I hope this will help.........