Badly Seated Fuel Injectors, Would they cause severe shake and hesitation? Options

[Celicatime]

My 94 GT failed the emissions test and so I thought I would be mr. fixit and replace the fuel injectors among other things.
First of all - the injectors are a pain in the axx to get to but when I finally replaced them, I'm not entirely certain I seated them correctly.

I put everything back together and started the car and now the engine shakes and hesitates from the get go and doesn't get any better after warm up. I had a perfectly smooth engine and now it acts like the engine is missing a piston.

Before I go to the work of getting at these stupid injectors again I wanted to see if it sounds likely that my problem is related. (sounds silly to even ask it, but I really don't look forward to doing this job again).

[Celicatime]

Oh, man! You don't think I'm beatin my skull against the brick wall enough already for frickin with my injectors. Now you've spun me into deep, dark, self-mutilating depression.

I'll keep messing with all the exhaust stuff. It's a bit of a goose chase. I follow the tests that the Chilton's recommends and they don't necessarily turn out the way the book describes them. The mechanic I trust has disconnected his phone so I'm ruling out taking it to a shop for now.