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Distributor cap and wires can easily be checked with fairly basic equipment, a strong light, good eyesight and a little know-how and this is of course something that is one of the most elementary checks for misfires and bad running and should also be a normal part of routine maintenance.
If the guy who changed your plugs knew why you wanted them changed and didn't check the cap, rotor, wires and spark quality and power as part of the job, I suggest you don't go there again.
Certainly the ignition system could be the culprit of your sputtering engine and it is the easiest to check and rectify or eliminate from your enquiries before advancing onto possible fueling faults.
Does this mechanic have a dianostic scan tool for your vehicle, so he can read the trouble codes.And he can reset the mil light using the scan tool.It is possible for somebody to not be paying enough attention to what they are doing and gap the plugs wrong or drop one and damage it.But if he did that and still put them in then you might want to find a new mechanic.It should not have went back to you if it still had a problem the first time.
The number 1 root cause for poor fuel economy is a vehicle running to rich, whether it be through a fouled spark plug, faulty ingintion coil, O2 sensor not functioning properly, and even through dirty injectors. I'd start by first inspecting your plugs and replacing them if its been a significant while since they've been changed. Standard heat index plugs normally last around 50k miles, newer specialty plugs like irridium electrodes generally last twice that. Sometimes you can easily check for bad ignition coils by first smelling them. If the winding is bad you'll have a strong burnt electrical odor, you can also visually inspect for any oil around boot from a bad gasket. That could potentially short one out. I would smell the exhaust to see if it is running rich (strong gas odor) that is an indication that one of my suggestions are at fault. If you have a d.o.t emissions testing facility nearby they can measure exhaust vapors for excessive hydrocarbon output too as well as for any trouble codes that may be in your system (Tn does for a $10 fee) I would also try adding a bottle of isoheet and a good fuel injector cleaner additive at least evrery 3rd or 4th fill up. Let me know what how these suggestions work for you and if you have any further questions
What kind of spark plugs did you put in it? The 4.0 litre engines in these trucks require PLATINUM spark plugs. If you put the wrong ones ( regular copper) it will miss fire and run like a bag of garbage. I had a similar problem with mine, the previous owners said "oh we changed the plugs and wires". They also changed the ignition coil not long before I took delivery. So, truck still ran like **** they said they even had to reset the inertia switch under the passenger side kick panel, everyone thought it was a fuel problem. I decided to pull one plug and volia..Wrong plugs. That also explains why they had to change the ignition coil. Hope this helps.
OK ALL TUNE UPS ARE DIFF. DEPENDS ON MILEAGE ,PROBLEMS OR JUST MAINT- WE WILL START WITH MAINT 100,000 PLUGS WIRES IF IT DO HAVE COIL OVERS.BOOTS IF YOU DO . FUEL INJ CLEANING FUEL FILTER AIR FILTER, PCV ,CABIN AIR FILTER. CHECK ALL VAC LINES,LOOK AT ALL DATA ON COMPUTER. I LUBE ALL DOORS,HIINGES CHECK FOR WEAR ON TIRES IF THERE IS AN ISSUE YOU ARE TRYING TO FIX SUCH AS A MISFIRE THERE ARE OTHER STEPS TO TAKE
I would change transmission fluid and differential fluids. check to see if it has a fuel filter also I know they stopped putting an inline filter somewhere around your year model and just has one in tank that doesnt have to be changed. you can also change air filter and inside cabin air filter located behind glove box . The spark plugs are platinum good for 100,000 then tune up needs to be done. plugs and wires, use only ac delco platinum plugs and ac delco wires. a little more expensive but way better to me than the others. they have coil packs so there is no distributor cap or button to replace.
At each 100,000 mile interval u need to replace the spark plug, at 30,000 the air filter and fuel filter, check the cooling system hoses and coolant every 60,000 miles, check the drive belt every 30,000, replace after 60,000. These are routine suggested maint items.
And don't forget to keep the pressure correct in the tires, under-inflated tires kill fuel mileage.