ok i have a 92 cx with stock motor with just aem intake and full cat-back exhaust... the problem is the car does not idle smoothly and the speedo does not work.. i got this car just recently and it did this already.. the guage cluster does not work except for the gas and temp gauges and signal also.. no tack in the dash and the car came with an aftermarket one that didnt work either. got it to work after searching few times on here.. so now the car starts up fine but after like 5 seconds the idle jumps to 1500 and back down.. i tried searching on here but no luck to the regular idle then the jump, blows a little smoke when idleing... and also the car stinks like gas and exhuast, any clues..thanks for any help...