Would like some help/ideas
 

So I got an alarm put last week and just recently my speedometer stops working about 15after I start driving. I'll be on the freeway and it just starts the need swings back and forth then just falls slowly to 0. And just the other day as I was going I felt a thud and a loss of momentum so I got out of gear and went back in and just got right back to normal. Recently had a coolant leak got it fixed but still got to degrease the parts that may have residue..


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