1993 Mazda MX-3 Questions

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Automatic transmission. Won't exceed 45 MPH. Felt trans slipping, but Non I do not feel it slipping. Seems to be running ok? But, still don't want to go over 45! Is it possible the trans could have "fixed" itself? I start in 1st, go to 20mph and put in 2nd, then around 30 mph go to Drive. Seems like it is ok now?

Dissapears after 1600 rpm, my buddy's uncle thinks it could be the oil pump is going bad and not getting enough oil at low rpm, does this sound like a likely problem/ fix if I replace it

We recently did a motor transplant, since that time, the shifting is very sloppy and now it is popping out of 5th gear and reverse is very hard to get into. I believe there is a bushing in the shift mechanism that may be the problem?

My 1993 MX-3 failed the low idle hydrocarbons test at the DMV. Can anyone help me with this problem?
(I am unemployed and cannot afford the $800 estimate that a garage gave me to replace the spark plugs and the oxygen sensors. I was told they needed to be replaced due to oil leakage.)

Thank you, very much.