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2005 GMC Sierra 2500 HD 6.6 , 4 “ straight pipe, AFE intercooler piping , head studs , 33’s,
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Discussion Starter #1
Hey guys , I have a 2005 GMC LLY . I was out hunting for about 6 hours creeping through the bush . When I put it in park the truck all of a sudden jumped to 1000 or so rpm with a loping / surge , similar to a high idle. As soon as I press on the brake it goes back to a normal idle with minimal surging . At full throttle it also loses all power above 2000 rpm and surges . There are no codes . I just replaced the FPR today and did not fix it . I’ve also rebuilt the filter head and makes no difference . Any input would be greatly appreciated
 
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