99 trouble codes

i have purchased a 99 1500 with a 4.8l
the day i bought it the check engine light came on it idles
real rough like from 500-1100 rpm until it heats up to normal
operating temp i took it to autozone they said it was bank 1
rich well after 160 bucks in o2 sensors i took it to a dealer
they were nice enough to check it for free and said
intake gasket was bad is there any way i can re torque them
to seal it up or just have them put a new one .....
any ideas i just want the damn light to go out

thanks

replace the intake gasket and switch to green coolant.....dexcool is hell on seals and gaskets

the reason the dexcool is used is I belive the green collant reacts badly in the engines due to there beeing cast steel and alumnium used in the construction

dex cool is far worse on these motors than green coolant just keep it changed every 2 years