[wjcbps]

my 130,000 '99 suburban 5.7l at 4x4 is missing badly in cylinders #5 &#7. the dealer replaced the cap,rotor,plugs,and wires. compression test is normal.did drop and balance test on injectors-normal. replaced upper and lower intake gaskets. removed valve cover -rockers,springs appear normal.inspected distributor appears normal to look at.dealer wants to remove head to check guides(would compression be normal with bad guides?)any help?