Like the title says my truck pulls hard all the way up till 2700-3000 rpm's and it falls on its face if you know what i mean, it just like loses all power it will stay the same speed but if i back off and go back down to 2000 rpm and give it gas it take off and pulls hard again what could this be? thanks for any help

 

How's your catalytic converter doing? If it's starting toplug up then your motor would have a hard time breathing at higher RPM's

 

no it dosent bog down or anything the motor sounds good when you get in it, it is just like the tranny disengages and we check the fuel psi and its at 48 soo.. idk whats wrong

EDIT: oh ya we just change out the sensors it the bottom of the transmission b.c it would studer shift it dosent studer shift anymore