WHAT IS THE GAP FOR MY 99 SILVERADO 5.3 LS SPARK PLUGS

Use the recommendations in the owners manual, where applicable. Different plug manufacturers may use different gaps? Some type spark plugs you don't gap, the gap is pre-set.

.043 gap should work ok.

In your owners manual

May be on a label under the hood

ALL auto parts & spark plug mfg sites,
have the gap shown when you look up the plugs

Under the hood on a label

The plugs come gaped

Gap is on all parts & plug mfg sites

In your owners manual

In your owners manual

Maybe under the hood on label

On all parts & plug mfg sites

They come gaped

NGK shows .052 I found it,need to use the internet better

ALL auto parts & spark plug mfg sites-- have the gap
next to the picture of the plug

All plugs come pre-gapped

I check mine- but they claim it is not necessary

The gap is in your owners manual

It may be on the label under the hood

1st, check to see if the fuel pump runs for 3 seconds when you turn the key to run (not start). If it doesn't run, then check the fuel pump fuse & relay in fuse box under hood, if OK, (spray starting fluid in the intake to see if engine fires at all), if no fire then look towards the ignition as the problem. There are 5 things need to start an engine: 1. fuel (delivered & pressure), 2. air, 3. spark (distributor/ignition module or pickup coil), 4. rotation & timing, 5. compression. any of these that are wrong or not there, the engine fails.

The firing order on the 351 that came in the 1995 Bronco is: 1-3-7-2-6-5-4-8
The spark plug gap should be on the emissions sticker under your hood, usually on the radiator support. It may also be on the underside of the hood.
If you cannot find the sticker, try a .044 gap, if that doesn't work go a little higher to a .052.

You always have to at least check spark plug gap

In 47 years, I have never seen a set of plugs that were not
knocked around & the ground electrode bent, on at least
a couple of them

You can clean a rotor & cap & get 3 years out of them,
no need to replace until they get too corroded

Wires last 15 years no problem
Don't get caught up in all the hype & tune-up non sense

The gap is on the radiator support label

The coil has to be tested,you don't throw parts at a problem

If it doesn't start, it has nothing to do with rotor,cap,plugs or wires

You could throw away 2 plugs & it would start on 6

The spark plug gap is usually set on the plugs when you get them new. But its best to check them with a guage. The spark plug gap measurement should be located on the sticker under your hood beside the engine size/i.d. or inside your owners manual.

Read the labels under the hood. Spark plug gap can quite often be found on one of the labels somewhere in the engine compartment.

If not, then the owners manual or a service manual that you can purchase.