Oldsmobile/Buick Repair: 1992 Oldsmobile Bravada, oldsmobile bravada, 1992 oldsmobile bravada

Question
I had a slight miss or ?, the vehicle was running a bit rough, so I recently had plugs, wires, cap and rotor replaced on my bravada, and it is a little better, but just not right.  I also was using a lot of gas, which I thought was due to needing a tune up, which seems to have helped.  The mechanic found a vacuum line off, which was one of the sounds I was hearing, so that is solved.  I know my car and I know that something just isn't right.  It has a slight rough idle and isn't as quiet as it normally is.  The engine is smooth and quiet usually.  I haven't lost power and only have 80,000 miles on the engine.  The car is taken care of and the check engine light has not come on.  I like to take care of any problems with my vehicles immediately as to prevent it from getting worse.  Can you help or suggest what this may be or what my mechanic can look for or do to find the problem.  Thank you for your time.
1992 Oldsmobile Bravada
4.3 Liter  6 cylinder
Vortec Engine
Automatic/AWD/Loaded
Clean/Sound Engine
Regular Oil Changes and Maintenance
No major/minor problems.  Great Vehicle
Sheryl

Answer
hello sheryl
i would tell him to check the timeing belt this can cause it to run a littile rough . Have him your mech. check the timeing belt bet this is it . good luck to u hun and i give you a lot of credit for knowing your car like u do . and u have a pretty name pete