No, I don't think it is losing pressure. Rather the shifting time might be too late due to throttle cable adjustment being too short resulting in a higher pressure required to unpshift to next gears.
If all the gears tends to upshift with a jerk, ( intensity depending on accelerator pressure ) then the cable requires some adjustment.
THROTTLE CONTROL CABLE
NOTE: Before adjusting throttle control cable, ensure throttle cable connecting accelerator pedal to throttle body linkage has .39-.47" (10- 12 mm) deflection with throttle closed. If deflection is not as specified, loosen lock nuts and adjust throttle cable.
1. With engine idling at normal operating temperature (cooling fan comes on), loosen throttle control cable adjustment lock nuts at transaxle control lever bracket.
2. Adjust lock nuts to synchronize movement of transaxle throttle control lever and throttle body throttle lever/linkage. Tighten adjustment lock nuts.
Friday, December 19th, 2008 AT 6:03 AM