Hi,

I have a 1994 honda accord lx that seems to shake for the first 2-3 minutes after starting it up in the morning. After it warms up it seems to be fine. I replaced the spark plugs and caps and rotor.

 

check vaccum controled rear engine mount

 

Change your tranny fluid, a warm-up issue is a fluid issue. I would also change the t-stat too

 

It could be a misfire due to a lean cylinder or two, not enough fuel for a cold engine, remove the vacuum hose to the fuel pressure regulator and plug the rubber hose, if this does not seem to help the cold start then clamp off the return hose to the fuel tank after the fuel pressure regulator, if this does not help then get a fuel injection servicing done or get some SEAFOAM and decarbon the engine and pour some in the fuel tank too.