The truck has a multiple misfire code. Vacuum hose are old but not leaking. The exhaust is shooting black globs of carbon out. The spark plug wires look almost new. I'm not a car mechanic but is there anything else I should be checking. Would a bad catylic converter cause a misfire? Someone metioned a spider injector. Are they known for going bad?

 

no the cat would not cause a miss fire. what motor does it have? if its the 4.3 get the distributor checked. mine had a random cylinder misfire and it was the teeth that drive it were wore out so it was stopping between pins and firing 2 cylinders at once. weak spark wont burn fuel. the spider injectors do go out. but if there is excessive carbon thats unburnt fuel probably. check your plugs and wires

 

Thanks man. Did what u said. Codes gone and trucks running great. Thank you

 

what fixed it then? glad i could be of help