Last time I went to Jiffy Lube to change my oil (no I don't do it myself >>) they told me I should do an engine flush and get my fuel injectors cleaned. Is this necessary? I had an engine flush and a manual transmission service done about a year or two ago, what do you guys think of these 'recommended' services?

Depends on the fluids. Do a coolant check (with the floating balls) and if you've gone 15-30k you might wanna consider doing an tranny oil change.

how many miles do you have ?

JiffyLube will always recomend that sort of stuff to be done. If you change your oil regularly the you probably don't "need" that stuff done. Buy some FI cleaner and put it the gas tank or better yet, get some seafoam and use that.

seafoam thread
another seafoam tread

sea foam it up