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Consider a ground out (bad wire) to the coil pack? Or low fuel/no fuel pressure caused from a dirty/clogged fuel filter or bad fuel pump? A qualified mechanic can measure the fuel pressure and fuel output. Good luck.
Some general thoughts - - when you try to accelerate, a couple of things happen. The engine shifts sometimes, and you put it under a load unlike when it is idling. Is it possible a wiring harness or a hose is moving when you accelerate ? Is it possible the fuel pressure or ignition module is not good enough to handle the engine under load ? Is the EGR opening early or something causing a vac leak and a lean fuel mixture ?
Check your coil output, buy a cheep spark tester. Pull of a spark plug wire and plug in the tester(ground the other end), set it to bridge a gap for 30,000 volts.Have someone start it and make sure the spark will jump the gap on the tester.Danger-Very high voltage! It will light you up if your touching the tester while the car is running!You'll be able to see a bright blue spark(and hear it as well) if your coil is good.If it's a yellow thin spark it's probably the coil.
If you have good spark, check the fuel filter and fuel pressure at the fuel rail.
Back firing could be timing,cam position or crank position sensor.Worst case scenario, timing chain or belt.
ok seriously why doesnt any post what engine they have in thier car well if it has a distributor it would have to be a 1.8 which i recomend removing and put a 2.0 in it that would fix the power issue but all in all is it knocking up and down idle could be mas or idle air speed sensor or even tps misfiring if you have changed plugs and cables then ur looking at a coil pack or distributor cap (whichever u have) after that ur looking at a cam angle sensor or distributor and if u have a distributor then look at ur coil (not to be confused with a coil pack) and i also have to ask has there been anywork with the timing lately (timing belt, water pump or oil pump replaced)
sound like fuel pump pressure low change fuel filter.if that dont fix it . probably fuel pump. if fuel pump good . get a scanner. because a bad coolant sensor cam sensor crank sensor . coil pack module could be bad.also bad pcm.