my 2002 standard B2300/4cyl Ford Ranger sometimes idles very low on start up, and it will jerk as though it were coughing when i engage in 1st and give it a tiny bit of gas. the jerking stops if i give it proper gas. oh yeah and about the low idle, it’s only after starting, not at stops, and once i give it a bit of gas it pops right back up to 1800ish and drops to 1200ish as it should. this happens less this summer but i’m afraid it will happen more often as the weather changes and i want to deal with this before winter hits. it feels like something is clogged… but what do i know! my baby’s got 119 000km and i bought it a year ago, no idea of its maintenance history.