My 2007 Opel Astra 1.6 essentia has a miss at low revs. Approximately 1500RPM while driving it normally occurs. Mostly when slowing down to turn and the accelerator is released then on acceleration th

improper install or stat defective

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

wasting money changing anything without first having the fault codes read
It is in limp mode so find out why first as it could be a transmission problem that put it in limp mode

Jerking or cutting fuel supply? How did you determine that? This is most likely a sensor in the engine. Could be a fuel pump relay but it most likely is a crank shaft sensor.

Could be plug catalytic conv.

to many reasons so have the fault codes read first then fix the faulty sensors

run the fault codes as what you have done may not be the problem at all

sure lots, you have misfire. when, say EXACTLY.
when does it and when does it not?
guessing is expensive?
misfires in gear or. parked in park or neutral,
or only driving?
why not do the 60,000 mile tune, why not?
spark plugs , that is top of list. not crank shaft sensors.
1: tune it up. spark parts and filters.
2: keyon, CEL glowing , check engine lamp ? good.
3: start car is it glowing now running, yes, that means SCAN it.
4: best practice would be to drive with scan tool connected OBD2.'
and watch to see if you get P030x misfire codes.
The ECU would have told you the CKP crank shaft sensor is bad or good. the ECU does that on all cars, no need to guess and go broke.
if very intermittent it shows up in OBD2 PENDINGS.
the ecu will report 1 in 10 ckp pulses, missing,(sensitive it is this monitor.

Physics.
Misfires:
1: weak compression on 1 or more cylinders.
2: bad spark, (tuneup time and scan it)
3:bad fueling, scan it. see it way off. (can be vacuum leaks)
4: coolant found in the combustion chamber, spark tips look UGLY. nasty . and repeats. with new plug. not looking is FAIL time.
5: EGR closed. at idle, so if misfire is at idle? , bam.
running the EGR is open, so its not egr, if running ,moving are you?

the above order saves time, and cash.
fuel can burn right with bad compression or spark so fueling is dead last.

check your throttle position sensor and your maf sensor.

I don't know if it actually works but I have read several times that toothpaste does a great job...