1995 mitsubishi rvr 2litre non turbo

need some help i have a mitsi rvr and it has a sputter problem that only happens sometimes when i leave a stop sign or in the mornings when i go to work i can put my foot flat to the floor and it it sputtering and bogging out then pump the gas and it fires away then drives good as gold took it for a hour drive down the highway and never missed a beat got home and it started again doesnt do it in park just in drive or reverse then other days it wont do it at all and runs fine it has no check engine light at all and is very weird how it only happens now and then its like a woman has 1 good day and 6 bad days got me stumped any ideas would be great