What causes multiple misfire on 1998 chevy silverado 1500 5.7 vortec 350?

Answer 1

I HAVE A 98 Z/71 5.7 VORTEC THE FIX IS EASY ITS THE KNOCK SENSOR

RANDOM MISSFIRE IS A BAD KNOCK SENSOR NOT SENDING INFO TO THE COMPUTER TO ADJUST THE TIMING ADVANCE OR RETARDING IT.

IT WILL RANDOM MISSFIRE ON A HILL OR UNDER A LOAD IT CANNOT ADJUST THE TIMING ACCORDING TO THE ENGINE NEEDS.

$32.99 KNOCK SENSOR @ O'Reilly auto parts part # 98012 will fix it   Chris......

Answer 2

had same problem ended up being the cap and rotor. The rotor had a bit of corrosion so start here.Originally changed all the plugs and fuel filter to find it was the cap and rotor good luck,

Answer 3

where is the fule pressure reulator at

 

Answer 4

check the fuel pressure regulator and the plenum gasket.

Answer 5

It is likely to be corrosion in the distributor cap.