1989 Honda Accord stalling out at stops.

Recently replaced fuel pump 1week ago. Was running a little better than before but sluggish uphill. Added 'seafoam' product 1/3 to intake 2/3 to full tank of fuel as instructed. Car ran much better and after putting a new tank of gas in car today and driving about 15-20 miles it begins to stall at stops. Engine idle speed is dropping too low and have to keep foot on gas pedal to keep it from stalling all the time. This goes on for about another 15 miles and when stopping at car part store to get tuneup parts and a new fuel filter it dosent stall out this time. Driving for a few more miles and one extra stop (at normal idle speed) it has stopped stalling as much but seems intermittent now. Noticed while in drive the car seems to jerk just bareley at lower speed/rpm do not know if this is related or not as this is also intermittent symptom.