Can anyone tell me if it is difficult and/or time consuming to replace the fuel injectors, fuel rail and pressure regulator on a 2003 Deville?

Will be replacing front coil pack cassette sometime in next couple days/weeks and am considering doing injectors too. E-bay has the whole set-up for $170.00.

No sense in spending money on something you don't need. If you have no fuel delivery problems now, why replace a perfectly good setup with an unknown source eBay item ?? For your peace of mind you could do a coil resistance check on all 8 injectors - 11 to 14 ohms with the max variance of all being 3 Ohms.

Your engine is far, far more likely to need a FPR (Fuel Pressure Regulator) long before an injector replacement.

What's the matter with the gray coil cassette ??

It's not a hard job, but I agree with Sub. Injectors are pretty reliable.

No sense in spending money on something you don't need. If you have no fuel delivery problems now, why replace a perfectly good setup with an unknown source eBay item ?? For your peace of mind you could do a coil resistance check on all 8 injectors - 11 to 14 ohms with the max variance of all being 3 Ohms.

Your engine is far, far more likely to need a FPR (Fuel Pressure Regulator) long before an injector replacement.

What's the matter with the gray coil cassette ??

Cylinder 6 misfire, changed plugs 2 mos ago, still have misfire. Dealer said it was probably coil cassette. Will forget about injectors for now. Car stumbles when accelerating from a stop. checked fpr using advive from posts here and servive manual, seemed to be working fine.

Thank you Submariner and Ranger

www.rockauto.com has OEM DELPHI coil cassettes without ICM for about $150; with ICM, $175.

You could probably cut that in half with a used unit from a clean wreck locally.

Waiting on coil cassette from rockauto w/o module, based on your post of couple days ago indicating the modules rarely go bad, part should be here tuesday according to fed-ex tracking.