Lol!! Exactly what in the true above statement warrants disagreement? Been doin' this for a livin' for 33yrs. now, and back when mid-70's thru mid-80's teeners were
being driven every day all year, this was a very common issue. Customer states sluggish accel, idle won't or is slow to come down, guess why? Granted 95% of those
were catalyst equipped, which may have contributed to the tendency, & it's unlikely the OP's RV has a cat.......but just the same..............
