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Bunker Hill, WV
Is this going to be a race truck , with no emissions and no accessories? No vacuum to brake booster?
And how many spark plugs are you trying to use? What are you referring to by top and bottom of engine? Is it 5.7L HEMI , not 4.7L standard V-8 as listed? Same plug for both 'sides of cylinder on dual plug set-up. MY OPINION , just don't get Bosch. AND ONLY GET what is listed as OEM! Possibly save confusion and doubt---get them from dealer. May be more expensive , but (theoretically) you'll know they are right!
Fuel should be going to injectors , not throttle body. Fuel pressure test and checking injector 'pulse' with a 'noid' light (not a test light!!..Can damage PCM that way). Test for power to pump Make sure it's for pump , not gauge. Test ground circuit. Find and TEST relay if needed.
Have you opened the hood yet , so you can tell us if it's the 4 or 6 cyl.?
What's leaking?????????? How much damage can your wallet handle???? Read the question , again , and then include info that is missing , in order to get a more conclusive answer.
Might be to late now , but you could bring it to a shop that has the right type scanner and watch live data on a test drive (if needed) to see what's going on. Tell them EVERYTHING you've done so far ,
Possible vacuum leak.....Define 'extremely high' with a number value...........or just post a question and don't respond. That'll fix it!
Why was the thermostat changed?