Hello all,
     Last week I replaced the gas tank in my 86 due to the fuel return inlet pipe cracked at the tank.  I installed a used tank but cleaned it thoroughly before installing.  Replaced both fuel filters and it ran perfect for 3 days now at highway speeds is surges and bucks.  It will idle perfect while sitting still. Fuel pump has a high pitched whine.  Were should I start?  Check fuel filters or fuel pump or both, I don't want to do either since it's 5F outside.  Thanks, Marcus

86gl
91carat