Codes fired after inoticed issues

I was driving one day when out of nowhere I
started leaking coolant I tore the top of the intake
off the engine and replaced a line that seem to be
recirculating coolant around the engine. However I
thought at the time this was a bleeder valve for
coolant because no one was found. So I use rubber
hosing and close off the little line recirculating the
coolant back around to the back of the engine
under the intake. The car seems to be holding
coolant and drives and runs. After this was
completed I ran test again for codes and mass air
flow and vacuum leak was one of the codes that
popped up along with a bad coil pack 7 for my
spark plugs. I replaced that part in the cold was
gone for the coil pack. I took the mass flow out
and cleaned it. Put it all back together plugged my
battery back on and everything ran and started fine
no engine light nothing. Im driving down the road
and right about 40 miles an hour my truck shifts at
that point it becomes shaky and stunted in my
acceleration. Hitting the gas from a stop causes a
jerk sometimes not always. I noticed that when I
turn overdrive off my car RPMs rise but the stutter
and shaking it is not so noticeable. Where to go
from here I'm assuming the torque control I've also
read up and found that it might be a couple of
other sensors, shift solenoids. With such a wide
spread of what this could be I'm hoping somebody
might be able to point me any more cost
affordable Direction. Last thing little detail that I
feel is important when I accelerate 55 through 60
my check engine light will flash a few times before
remaining lit only after I let off of the gas. I've
looked this up and this says that it could be Many
misfires and multiple cylinders. Even though at the
time I wasn't throwing codes for that.