Hesitation problem

[the86jimmy]

i have an 86 jimmy with a 2.8 in it it is 2 wheel drive,the problem im having is it idles high and hesitates when i try to take off!sometimes it even makes like a spuddering noise wich sounds like a backfire but not as loud and comes from like the engine compartment! now i have old rusty manifolds with a couple of leaks so im thinking ,aybe thats causing the hesitation but i dont think so! so any help would be appreciated! thanks

[TheProfessor]

is your timing set right

[bud36light]

try the simple stuff first for high idle. cracked or broken vac hoses. Then check EGR valve(is it dirty or defective(broke)). Then the intake gaskets. This shit can be a common problem on all motors.