I have no power and it sounds like it is back firing maybe through the exhaust manifold

Ok I have changed all wires plugs (none are crossed) it has no distributor changed fuel filter fuel pump catalytic converter erg erg sensor maf sensor and pcv. I have checked compression fuel pressure exhaust back pressure transmission spark (and gap in all plugs) timing. So I did a compression test and 2 cylinder were at 65 psi so I did the head gasket (blown between two cylinders) runs perfect.

Hello my name is Marc. I just recently purchased this truck. It ran great for like three days and then all the sudden started jumping around on me and backfiring and jumping a lot. Lol. Then it got to the point where I lost power and it would not even start again. When it runs it seems to run great, but when that starts happening I have to let it cool off for quite a while and then do it again. Its not really even drive-able at this point because it happened so soon. Anybody have any ideas? I already changed the ignition module sensor. And I do not have power for them to check codes on shop my connector has no power to it for some reason. All the fuses were tested and tested good. Please help! Thank you so much everybody! :-)

My problem with my truck is this.I have had new wires and plugs put on it plus a new fuel filter, but it is running rough when idling or when it is being driven anywhere. It misfires and is backfiring too.I need to know what else could be causing it to be doing this?

First pull the plugs off of the coil pack one at a time to remember where they go the metal piece where they connect should be bright and shiny
if the are not shiny that coil is bad

run some fuel injector cleaner through the gas tank

the only other possiblty is a bad fuel filter

i meant to say bad fuel pump

Runs fine win I give it gas then it backfires win I hold it at speed