idle fluctuates between 800 and 1,700 rpm in park

When you replaced the engine was this a used engine and what was swapped over from the old engine? Meaning was the fuel injectors from the old engine or did they come with the used engine?

If this was a new engine, same question. Do you know what was swapped from the old engine?

Lastly do you still have the old engine?

It was a used engine. JDM was the seller on e-bay. It was to have between 50,000 and 65,000 on it. I do not recall if the injectors were swapped or not. It has been over a year since it was swapped. I no longer have the old engine.

Okay. So this issue just started and it was running fine until now?

No, my son it idled a little high after we switched it out. runs well except the idle.

Okay. I am sorry for asking this a number of times but it helps to know the history. The fluctuating idle between 800 and 1700 was not happening after the engine was replaced a year ago. The idle was higher but the fluctuating just started?

Fluctuating idle is most likely a vacuum leak. Here is a guide that we need to check and rule this out:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Sorry it took so long to respond. The car will not run at all. Parked it, went inside came back to start it and it would crank but not start. We have replaced the crank, mass air flow, both O2S, and throttle control sensors. Help.

No problem however, we need to get a new post started for this at this point. The reason is, others will not find the solution to a no start under this heading.

https://www.2carpros.com/questions/new

Sorry for the inconvenience but let's get a new post started and go from there. Thanks