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Good question....probaly not if they find evidence of water inside car.....lots of things can be damaged by water that causes corrosion in electrical conections. Best take it to dealer and see what they say.
Did the gasket from the old oil filter stay stuck to engine? Next inspect the theads where the filter screws on for damage.
Really depends on where it is leaking from.....oil pan plug gasket would be a cheap fix, but a rear main crankshaft seal would be several hundred bucks. Best to take it to good repair shop that has had lots of exsperience in engine to repair to inspect for the source of the leak and quoat you a accurate price.
TSB 04-06-04-003A Tech. bullentin list new parts for fuel filler neck and hose for this problem. Check at GM dealer for updated parts for your truck. They will need the VIN # to check for you.
My motto if its not broke don't try to fix it. Only certain vehicles have egr port issues and its usally a design flaw. If you are not having a symptom of spark knock or other poblems its probaly better left alone in my opinion.
Contact the manufacture of the kit for their sugestions.
I question the need for either service. If you are not having problems with oil burning/oil comsumption or fuel injection problems. I assume that your car is fairly new and still in warranty. The routine maintenenace that is listed in your ownwers manual are the services that you need to be concerned with.
Most likely cause is a wheel speed sensor if failing. Need to check stored fault code with compatable scan tool first.
Likely the timing chain and guides will need to be replaced. Not uncommom on this car when it reaches higher mileage approx. 150k miles.
I assume you had a wheel alignment after that work was done....also best have a good shop take a road test for you so they can advise the cause of the noises.