GK wrote:

<skip>

> When I put the belts back on, I remember wondering
> if I had properly adjusted the tension on the timing belt.
> I think I was having a hard time accessing a bolt. Could this
> cause a rough idle ("dieseling") and a very slight vibration
> at higher rpm's?

Minor nit, dieseling is not a rough idle - it refers to a spark engine
continuing to run after the ignition is shut off:

Dieseling in spark-ignition engines

A gasoline (spark ignition) engine can sometimes act as a compression
ignition engine under abnormal circumstances, a phenomenon typically
described as pinging or pinking (during normal running) or dieseling
(when the engine continues to run after the electrical ignition system
is shut off). This is usually caused by hot carbon deposits within the
combustion chamber that act as would a glow plug within a diesel or
model aircraft engine. Excessive heat can also be caused by improper
ignition timing and/or fuel/air ratio which in turn overheats the
exposed portions of the spark plug within the combustion chamber.
Finally, high-compression engines that require high-octane fuel may
knock when a lower-octane fuel is used.

http://en.wikipedia.org/wiki/Diesel_...nition_engines