Assuming the bulbs are good, the turn signal problem could be a blown fuse or a bad flasher relay.
The hesitation when starting could be incorrect fuel pressure due to a failing fuel pump or fuel pressure regulator.
Probable causeFlasherFusecontrol lever
one of the lights is not working
Aren't they different flasher relays
Yes, the doors from a 98 Chevy Blazer will fit a 2001 Chevy Blazer with a little moderation.
There is no timing to set. The timing is controlled by the ECM with signals it receives from various sensors.
Check the turn signal relay. The four way flasher and the turn signals each have their own relay. It has a fuse for the turn signal
If the turn signal bulbs light but will not flash, the flasher relay is defective, replace it.
Yes.
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The voltage gauge on the Blazer is not the most accurate (cheap) When using the signals the voltage draw on the system is enough to make the gauge move slightly.