It was ok until next morning

If it sounds like a sort of knocking noise, it could be that you are using a gas with to low of a octane level. See what happens if u put higher grade gas in or go to auto parts store and try a 5 dollar bottle of octane booster on your next fill up. If that quiets your noise that could be your problem.

this happened to my car get new fuil pomp

Chech the air flow sensor in the intake usually just after the air cleaner box-very carefully clean it.Cheers Denny

It isn't over heating correct? When it starts acting up, what exactly is happening? Any engine light coming on?

Choke isn't suppose to turn off until engine is warm. When was last healthy tune up? Replace plugs, wires, ALL filters especially FUEL filter and run a good fuel system cleaner through it w/next tank full of fuel

You didn't say how much fuel is in the tank when this happens. Some of these old GM cars will starve for fuel if the tank is near empty and you are braking or stopping with the car facing downhill. It could be rust or scale in the fuel tank clogging the screen around the fuel pump inlet. Sometimes, putting cleaner in the tank of an older car will only cause more debris to loosen up from the inside of the tank and make the problem worse. If the problem gets worse, I would guess tht a new fuel pump/sloat assembly is in order. You may have to have the tank removed and cleaned or replacedd with a new one to prevent the problem from reocurring.

Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?

Saw this service bulletin---

TAPPING / KNOCKING NOISE FROM ENGINE AT COLD START
This bulletin amends ITB02-049. This version amends the Applied Vehicles.
Please discard all paper copies of the earlier version.
APPLIED VEHICLE: 2002 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
2003 - 2004 FX45 (S50) with V8 engine.
IF YOU CONFIRM:
A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine,
NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours.
ACTIONS:
1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon
deposits were the cause of the noise.
• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
release the accelerator quickly, as soon as the engine reaches 4,000 RPM.
• The noise should disappear immediately if carbon deposits are the cause.
NOTE:
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
duplicate it, the cause may still be carbon deposits. Go to step 2.
• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
one described above, go back to ASIST for further diagnostic and repair information.
2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the
label.
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

Hope helps.

make sure you have proper sealing washers under injectors,and you have only one washer in place ,ihave seen it happen before 2 washers will cause a loud knock if not that get injectors calibrated good luck

spark knock is usally poor fuel.
try a tank or two of premium with cleaning additives.
if that works when try the next lower grade untill the knock returns.
then just use the lowwest grade that did not knock.

DIRTY FUEL INJECTORS. RECOMMEND BOTTLE OF FUEL INJECTOR CLEANER NEXT FILL UP.(SUPER CONCENTRATED) BUT NEXT TIME YOU PUT GAS IN,JUST DO 1/2 TANK,THEN ALL BOTTLE OF CLEANER FOR THE INITIAL TIME,THEN FULL TANK AND BOTTLE EVERY OTHER TIME:):):):)