94 jeep runs will only start in nutral. Runs 20mi 1/2hr n stall

So my 94 jeep grn chrke is throwing a coad of 27. I hav replaced the crankk
shaft pos censor already. This is a 2 part problem. It only tsarts in nutral. Then
runs for like a 1/2hr shuts off n wont start again fr hrs. Next day fires up no
prob. My jeep is a 1 owner im 2nb I bought it from my frnd when he dad passed
fr $500 it sat lieke 2 yrs in wether b4 that garage kept. Only got 114,000 on it all
original.