Considering both labor and parts, the approximate cost for replacing the specified components, including six fuel injectors, six spark plugs, three back bank ignition coils, one upper intake manifold gasket set, and one lower intake manifold grommet, could range from $1200 to $2000 or more, depending on factors such as location, the specific shop, and the brand of parts used. It’s advisable to consult with several reputable automotive repair shops to obtain accurate quotes for your specific situation.
It will likely cost somewhere in the range of USD $180 to $405 for aftermarket parts.
Fuel Injectors - Expect to pay around $30 per injector, so $30 x 6 = $180 for all six.
Ignition Coils - These can run around $50 each, so $50 x 3 = $150 for the three coils.
then some extra for lanout and you are good to go.