Vehicle is a 99 Mazda Protege ES 1.8l. Manual transmission.
I drove this car in a trip to Arizona and noticed that it was shaking a lot if I drove it at 70 to 80 MPH. I thought it was the motor mounts since I could see some cracks in the lower front mount and passenger side mount.
I replaced both today and it made a difference in idle vibrations and shifting, but noticed vibrations when accelerating on the freeway. I thought maybe it was tire balance. I got the tires brand new and had to redo ot twice because the first shop. Did a crappy job. I also thought it could be the driver side. CV axle.
But the vibrations got even worse when I drove on a hill. I tested accelerating in all gears and they are all fine, except on 2nd gear.
I also performed a clutch test and it seems fine. Could it be the mounts? I ordered the parts directly from mazda, but noticed the rubber portion of the lower front mount looked different in terms of thickness.
I also replaced the spark plugs, but not the wires. I don’t see any leaking axles, they are supposed to be brand new. There is a lot of residue in the transmission area, which I believe is what was left from the cv axle seal leak the vehicle had before.
What could it be?