For the weak pull of your car you may have a partially blocked injectors that you have to clean,there are shops in salwa road who can do the job automaticaly in half an hour, they will charge you around 400+QRs,or you can use a complete fuel system cleaner (available almost every where) which will cost you a max.of 40QRs by adding all of the bottle to your half full fuel tank then refuel it fully the same time,then you have to drive your car on a high way to the max.road speed limit.you might as well change the fuel filter and the spark plugs.this also might be because of your automatic gear box old oil and filter,get them checked I'm sure they need to be changed.
for the suspension sound it is hard to tell what might be the problem as there are tons of reasons and deffirant sounds which you did not mention,get it checked by a good mechanic as it might be something minor.
for your air bags indication,mostly the cause will be a bad sensor or a program fault(if you are sure there was no previuos accident),there is a shop in the main airport road who can diagnose and reset this fault with a reasonable charge.Good luck