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Shelly 10/23/2016

1997 Mercury Mountaineer Base 8 Cyl 5.00L

Transmissions & Drivetrains

Why does it jerk when step on accelerator

Just recently started when step on accelerator it jerks makes thunk sounds and feels like gonna drop either back-end or the transmission also some times it feels like gear shifter in park but it didnt go all the way then try again and does go rest way sometimes have to start in neutral and sometimes key dont like to turn and something always rubbing front driver tire down replaced struats and shocks still does itand there a vacuum hose that i have to plug so dont die could the vacuum be y u have to slam on breaks for heater to kick on and ac worked at 1st after recharged but not long and would only work sometimes

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