How are the cap and rotor? Did you replace or inspect those? They're usually easy to remove, and once off, you can check them. The cap will have contact points on the inside (one per cylinder) and the rotor spins around inside, touching each point in turn and triggering the spark. If the edge of the rotor is smooth, it's worn out - it should be ridged like the edge of a quarter. Likewise, if the contact points in the cap are worn down, no spark will be created for the plugs to fire.
There are a bunch of modules in the truck - maybe an ignition control module (ICM)? I don't know if your truck has one or not, but that'd be worth checking into as well.
There are a bunch of modules in the truck - maybe an ignition control module (ICM)? I don't know if your truck has one or not, but that'd be worth checking into as well.
Answers & Comments
How are the cap and rotor? Did you replace or inspect those? They're usually easy to remove, and once off, you can check them. The cap will have contact points on the inside (one per cylinder) and the rotor spins around inside, touching each point in turn and triggering the spark. If the edge of the rotor is smooth, it's worn out - it should be ridged like the edge of a quarter. Likewise, if the contact points in the cap are worn down, no spark will be created for the plugs to fire.
There are a bunch of modules in the truck - maybe an ignition control module (ICM)? I don't know if your truck has one or not, but that'd be worth checking into as well.