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]

Do you have 2 cats on your 94? I can't find a cat anywhere on the bottom of the car - just a resonator thing and the muffler. I can only assume that its under the exhaust manifold heat shield like on my wife's Camry.