Side/window Air Bag problems of the 2008 Suzuki Forenza

Purchased a 2008 Suzuki Forenza on 9/8/2008. Acceleration concerns, a ringing noise from the engine and my passenger side air-bag notification light was reported 9/16/08. Told by phone the car was new and would need to be driven for a couple of weeks to warn up. 9/16/08 ringing noise was louder had acceleration concerns, timing cover had melted due to friction from the belts sliding. Invoice reflects electrical body work as such: “ side airbag light not on tension on wire harness connector under the driver or passengers seat could cause high resistance - relocate both harness and secure them. " 10/27/08 reported tapping noise at engine when starting car, acceleration was dragging and air bag light. Invoice findings - no problem found - told not to expect performance on acceleration. 1/17/09 (car released 1/23/09) side air bag light indicates it is off, cruise control dropping, transmission not accelerating, engine running loud until warmed resolution - timing cover replaced other issues found to be working to factory specs. 6/18/2009 -acceleration is slow, car downshifting at high speeds, transmission not shifting well while coasting, must come to a complete stop to switch into gear: resolution - Suzuki helpdesk ticket 175996598 suggested to re-initialize tcm (transmission switch). 10/1/09 - same issue as 6/19/09 - revving higher and loud in cold and damp weather told no new info: issue seemed to subside – no work done to my knowledge. 12/30/09 same issues as 6/19 & 10/1 timing cover adjusted told acceleration was normal. Fix for timing cover January 5, 2010. 8/1/10 & 10/26/10 taken in for acceleration & maint. After near accidents and problems driving between the speeds of 15 and 60 mph: nothing addressed. 1/4/11 - transmission switch was replaced by a different Suzuki center. Told transmission or engine can go out. Acceleration issues have returned side airbag still shows off when occupied by person 120 plus pounds.