Hesitation and slight popping during acceleration? Why?

[GhettoPop]

i have the same problem. when the car is cold and I put the engine under load, it will hesitate and the exhaust will pop. a second or two later the engine will respond normally. it happens in 1st, 2nd, and 3rd gear. it starts up fine, every once in a while it will want to stall out right after i start it. if i give it a little gas or start it again after it stalls once, it will idle fine. idle is good when cold and warm. once i drive for 5 min and car warms a little, no more problems. injectors, TPS, TB, etc are all stock with 130,000+ miles. the timing is at 14 and i run 87 octine gas as i get no pinging and i have been running good at that timing before this problem started. i dont think i have any vacuum leaks but will check with a gauge at the tree. i will also check the tps voltage and i already have a new pcv valve and screen to pop in. will post my results...........

how can i checl fuell pressure? is there any gain to buying an adjustable fuel regulator and adjusting fuel pressure on a stock engine?