Not an exact estimate but ive been in a shop for years now and id say roughly eight to nine hundred dollars. due to the fact that you can rarely replace only the gasket as usually the reason the gasket blew out is from broken bolts on the manifold which when not holding tension allow the manifold to warp requiring the manifold to be replaced as well.
SOURCE: how to fix blown head gaskets on a 1996 tahoe
its not the head gasket it is the intake manifold gasket and you can bypass all the throttlebody seal by removing all the wires and taking it off these are very bad at doin this cause they have a plastic gasket look up some pics on it it took my and a friend bout 5 to 6 hours to do but the shop wanted 700 dollars so that saved some money.
SOURCE: My 1999 chevy tahoe is leaking antifreeze. I
it could but- check passenger side front where heater core line go into manifold right behind alternator the hose line is connected by a press clip into an alloy fitting this fitting gets eaten away by anti freeze and hose angle pulls back on fitting the part is $18 at dealer and is screwed into manifold use caution if ur r going to replace at very edge of aluminum manifold---and check ur water pump bolts the 2 longer ones should have a lock sealant on them they bolt in thru a water jacket
SOURCE: Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold
On 5.7L engines, install the bolts and torque in sequence as follows:
SOURCE: service engine soon light on 2002 chevrolet tahoe stays on
That normally means that you have a issue with your gas cap try replacing your gas cap first then diconnect the negative terminal of the battery for about three minutes to clear the memory and start the truck again
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