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2007.5 2500hd Silverado 6.0 hesitates on fast throttle.

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2007.5 2500hd Silverado 6.0 hesitates...
2007.5 2500hd Silverado 6.0 hesitates on fast throttle . Barely any acceleration up to about 45 percent throttle until it downshifts , runs fine wot. Runs better tuned or with maf unplugged but pops back thru intake more with sensor unplugged. I've spent $4000 at 2 dealers over the last year and 65000 miles . They changed cats , replaced exhaust manifold bolts and gaskets , map sensor , evaporative purge valve , throttle body , crank sensor, all oxygen sensors , maf sensor , plugs and wires and fuel pump . Truck sounds like it's sucking air when you accelerate and not getting fuel. When the sensor is unplugged what I notice is the timing advances quicker . Only code is for ambient air temp sensor
Submitted: 11 months ago.Category: Car
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Customer reply replied 11 months ago
Gets worse as outside temperatures rise
Customer reply replied 11 months ago
On cool mornings it runs almost perfect
Answered in 3 hours by:
8/6/2017
Auto Mechanic: FixItMan, Master Technician replied 11 months ago
FixItMan
FixItMan, Master Technician
Category: Car
Satisfied Customers: 17,593
Experience: AA DEGREE AUTOMOTIVE/DIESEL TECH
Verified

Hello, my name is***** this occur every time you drive it. Is the truck stock?

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Customer reply replied 11 months ago
More with outside heat or if you leave it idle for 10-15 with a/c going . In the winter time you can't tell anything is wrong
Customer reply replied 11 months ago
I'd rather type . The screen wouldn't go away so I hit the call button sorry
Auto Mechanic: cloe0626,
 replied 11 months ago
cloe0626
Category: Car
Satisfied Customers: 2,076
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