jerking

[stickerbuoy]

bad spark, caused by?
spark wires bad? dizzy cap and rotor ok.
bad ignition coil?
full stall , if engine hits 100 that is a full stall.

is car , A/T or M/T you have 3 listed.
the 5peed will not go to 100 rpm. moving fast. the drive line will keep engine way fast. at stalls.
A/T can stall easy, its pump dies. and it not in neutral.

if the RPM was high, and tacho shows 100 that means the coil ignitor is bad or ignition coil is bad or wires to it bad. (connections)
if RPM was really 100, then tacho didnt lie. it stalled.

---

It's the red 2-door, as usual.

The tach is not jumping down 'to' 100, it's jumping down 'by' 100 or 200 RPM. So if it was at 3500, it would dip down to 3400 or 3300 very briefly.