Do you think this quote is reasonable for my car the intake manifold repair? Tx!

It may be a little steep, but not unreasonable. Without knowing exactly what is being replaced, it's hard to say for sure, but this is definitely one of those kinds of jobs where two bad things could happen: 1) many parts will not survive dis-assembly, so you're better off assuming that they will need to be replaced. 2) Many parts that do survive dis-assembly and re-assembly may not last long after, because we're talking about 10 year old plastic and rubber parts. My gut feeling is that this is probably on the up-and-up, and if you shop around, you may get a better initial quote, but chances are you're going to get call backs from the shop halfway through the job telling you that it is going to be extra for one unanticipated cost or another and you'll end up paying the same in the end. Assuming that they have a comprehensive parts list, I would say go with this quote, it sounds like they've already figured in what could go wrong.