1997 Ford F-250 temperature gauge fluctuation

1997 FORD F-250
280,000 MILES
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ROMANO97
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i havechanged everything possible on the coolant sysytem to cure this and the gauge still goes high when i puch the gas hard and then low when i let off and then the coolant pukes out. the truck has a 460 big block engine.
Jul 4, 2013 at 12:06 PM
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DOCFIXIT
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So radiator,water pump, thermostat,hoses fan clutch block flushed all that done ? if yes NAPA has a block tester to see if exhaust is present in coolant.
Jul 4, 2013 at 12:19 PM
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ROMANO97
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havealso changed head and intake gasket and all that you said
Jul 4, 2013 at 12:23 PM
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DOCFIXIT
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So if drive around town traffic no overheat? AC on no overheat? only overheat when hard accelerated? if yes to all three maybe gettting lean fuel suppose no check engine light? clean MAF with a MAF cleaner truck has TSB on lean overheat due to contaminated MAF
Jul 4, 2013 at 12:45 PM
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ROMANO97
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it only overheats when you pull something or run it hard
Jul 4, 2013 at 12:53 PM