by 
brandon
ANSWERS: 6
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It needs a service - air filter, plugs check or change, HT leads check, battery and alternator check and valve clearances / compression tests
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If it is an injected model the cheapest thing to try first is to run some injection cleaner in your next fillup. Maintenance is obviously my next question but I am assuming you do change oil, filters, plugs when needed yes? If injection isn't an issue you can always try just clean filters and due a major tune up...distributor cap and rotor, plugs, plug wires, etc, then time it correctly...this you can easily do yourself and save a ton of money. Let me know, there are other inexpensive ideas.
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An internal combustion engine will fire properly if has correct spark, proper fueling & decent timing. You need to know which one is the problem before your time & money disappear.
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re:injector cleaner ..if you suspect water or condensation in the gas..use a cheap truckdriver trick.when your tank gets down to 1/4.add 2-3 pints of rubbing alcohol to the tank.it mixes w/ the water and burns it out the exhaust.when it gets to empty,change the gas filter and add 1 pt and fill the tank w/premium gas.this should allieviate any water in the fuel system
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Requires a possible tune-up and service check.
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Please clarify what type of truck you are talking about. This question is in the Trucks and Busses Category, which is for heavy trucks. If you are looking for light truck (pick-ups ect.) information, please specify. There's a world of difference between what can make a Freightliner or Peterbilt run badly versus what can cause the same in a Ford or Chevy. Thank you.
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