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what would cause my car to run fine when it has first started up then after a while first gear will kinda bog down.
it,s the bearings or a bad gear.
bad synchronizer
sycronizer probably going out since that gear is primary when gearing down from 5th
vehicle is still in gear, step on clutch
This is called stalling. It occurs when the gear-shift doesn't change gears correctly because of changing on a bump (train-tracks).
main shaft bearing
You could have ignition problems if it is the engine causing the jerk.
A problem in the fuel line could cause it to stall. On a stick shift, letting off the clutch too soon would cause the vehicle to stall.
Does your car have overdrive? Does it stall when going uphill? If you answered yes to these it is possible that your transmission kick down isn't working.The kickdown basically detects when the car becomes under load and shifts the transmission down a gear.
Bad struts can cause vibrations while coasting in first gear on a 1993 Mitsubishi 3000 GT VR4. A bad tire can also cause this.
A transmission that is sticking would cause a 1997 Plymouth Grand Voyager to die after shifting it into gear. A problem with the ignition system could also cause this.