I would replace the ignetion module that is in the distributor.
are you getting spark?
There will be no spark on a 1994 Chevy 1500 5.7 Suburban if no power is getting to the ignition system. This can occur from a damaged wire, loose connector, or failed component.
You are missing fuel or spark.
If your Honda CRV cranks but won't turn over because the spark plugs are not getting spark, ensure the wires are connected. A loose spark plug wire can cause this issue.
A person must leave the right size gap for the spark plugs when changing them. The 1999 Chevy Suburban has a spark plug gap of .060 inches.
A 2003 Chevy Suburban will crank but not start if it has no spark or fuel. Checking for a clogged fuel filter or fouled spark plugs can help to resolve the problem.
take it to the dealer
.035
.045
Check the ignition coil located on the top left side of the motor, mine went bad and I found one for $5 at the junk yard.
The spark plug gap in your 1999 Chevrolet suburban is dependent upon the type of engine. The standard engine spark plug gap is .011.
5.7l & 7.4 = .60