What is the plug gap for 2003 Chevy Suburban with V8 Z engine ?

Spark plug gap will usually not cause the engine to stall out. This vehicle should be fuel injected. The idle is controlled by the computer. How did you set it up? Have you scanned the computer for trouble codes to point you in the right direction? Check for vacuum leaks.

it should be 0.060 there is an emission info tag possibly on the fan shroud or radiator support that has the gap info in the bottom corner.

SPARK PLUG GAP IS 0.060

I prefer bosch plugs :

2000 Chevrolet Tahoe 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2000 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2001 Chevrolet Tahoe 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2001 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2002 Chevrolet Tahoe 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2002 Chevrolet Tahoe 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2002 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2003 Chevrolet Tahoe 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2003 Chevrolet Tahoe 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2003 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2004 Chevrolet Tahoe 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2004 Chevrolet Tahoe 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2004 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe LS 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe LS 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe LS 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe LT 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe LT 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe Z71 5.3L 323CID V8 FLEX FI Z - GAP=0.040"; Original equipment is iridium. 2005 Chevrolet Tahoe Z71 5.3L 323CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe 5.3L 5328CC 325CID V8 FLEX FI Z L59 - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe 5.3L 325CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe LS 5.3L 5328CC 325CID V8 FLEX FI Z L59 - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe LS 5.3L 325CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe LS 4.8L 294CID V8 GAS FI V - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe LT 5.3L 5328CC 325CID V8 FLEX FI Z L59 - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe LT 5.3L 325CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe Z71 5.3L 5328CC 325CID V8 FLEX FI Z L59 - GAP=0.040"; Original equipment is iridium. 2006 Chevrolet Tahoe Z71 5.3L 325CID V8 GAS FI T - GAP=0.040"; Original equipment is iridium. 2007 Chevrolet Tahoe LS 4.8L 294CID V8 GAS FI C - GAP=0.040"; Original equipment is iridium. 2007 Chevrolet Tahoe LS 5.3L 5328CC 325CID V8 GAS FI J LY5 - GAP=0.040"; Original equipment is iridium. 2007 Chevrolet Tahoe LT 5.3L 5328CC 325CID V8 GAS FI J LY5 - GAP=0.040"; Original equipment is iridium. 2007 Chevrolet Tahoe LTZ 5.3L 5328CC 325CID V8 GAS FI J LY5 - GAP=0.040"; Original equipment is iridium

I suspect you have had an oil pump failure. To get at the rotory gear oil pump you will have to drop the oil pan. After you take the pan off, ( having drained the oil the oil pump is what the oil pick up line leads into. That pick up assy. is a round shaped disc with a screen inside it. Clean the screen first then the oil pump. Install new oil pan gasket on reassembly. Hope that helps you. Please let me know.

Hopefully the engine was not damaged when the pump broke. If it was you may need a complete engine rebuild, MAYBE.

Make: CHEVROLET
Model: TAHOE
Year: 2003
Engine: V8 - 5.3L - FI - - FLEX

All details here:

Standart:
- Champion RS14YC .040" (OE GAP)

Premium Class:
- Champion Double platinum 7983 .040" (OE GAP)
- Champion Iridium Plug 9405 .040" (OE GAP) (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope helps with this (rated this help) Good luck.

could be anything from the weird to the sublime so i couldnt evan hope to tell you unless i had the vehicle in front of me sorry

Gap is .045
Firing order is 1-8-4-3-6-5-7-2
1-3-5-7 is on the driver's side
2-4-6-8 is on the passengers side

There is no fuse specifically dedicated to the fuel pump on this year and model of Suburban. This Suburban is equipped with dual tanks and as such has two relay switches, primary and secondary, both of which are located at the main fuse box in the engine bay, that power up the respective fuel pumps.

The closest fuse (15A) controlling either of these relays also powers up the main control module (located beside and below the main fuse box). So, if one needs to disconnect the fuel pumps from functioning, then the only effective method is to disconnect the fuel pump relays.

Fuel filter plugged.