yes, you are causing it to run richer.
Check the fuel filter or the fuel pump.
acceleration is a measurement of increased speed change (deceleration being that of decreased speed change). your current speed (Whether fast, or slow) is irrelevant, as long as it changes, and increases, which means you are accelerating.
By D-accelerating
it depends what speed is fast and what speed is slow and what car you are talking about.
hard and fast
Fast moving water.
check cat converter if it has 75000 miles or more
not a fast but slow
* How would you describe the pace at which you work? * The pace of work has been dramatically accelerating since the mid 80's and now approaches what could be described as instantaneous.
Fast moving stream
Passing or drop down gear slow in reacting maybe
slow-fast-slow (Apex)