Engine Performance problem
1989 Oldsmobile Delta 88 6 cyl Two Wheel Drive Automatic 184000 miles

i have a 89 olds 88
call it my ole skool (lazyboy)
i had a no start like a month ago and i diag it and found a bad ecm so i change it.. and it fire up like it was suppose to. maybe like a month later it started acting funny, when i drive wit like maybe 20% pedal it feel like it wasnt gettin enuff feul to the injectors or da pump was getting weak. like bogging out. but if i floor it.. no problems but drivin slow feel it all da time.. like i got a weak spark but like i said if i floor it really cant feel da problem only when i start off slow like at a stop sign or red light.. now already (cuz i work on cars but jus recently retired) i change da fuel pump, Crank sensor and da ecm.. but dis new problem came when i replace da ecm.. jus started like a month after i change it... could da ecm be fault. of cousre i brought it new, now this my second time changin da ecm. but da first time i change da coil pak's too, like 3 years ago.

thank you