it a 4.3 the cap and rotor are good It looks like the wires ans plugs were changed not to long ago, But I get like 6 mile to the gallon.. I want to check the timing , any wire to disconnect to stop the computer from adjusting the timing? any ideas what to check for poor mileage and the miss?

 

fuel pressure 60 -62 psi
plugs
intake gasket

 

Check the firing order on the engine, it's easy to get them confused

 

whats the firing order on this truck?

 

165432

 

Pull one or more of your plugs to check for fouling. At 6 mpg I'm surprised you're not throwing a code. Even though you say the cap n rotor are good, take the cap off and clean the contact points. It's easy and can only help.

 

I took they off the pins arnt rounded or black just a bit white. I replaced a vacuum line going to the vacuum ball on the hood I have received 100 mile on just 1/2 tank of fuel as of this time. I need to get a diagram of the engine for what cylinders are what number.

 

The top of the cap is probably numbered. It should be in order like that.

 

i mean the engine I forgot what cylinder is 1 2 4 5 6

 

The engine should be in the same order as the cap is.