God NO!! Not Bosch plugs!!!
Bosch +4 are junk, if not an illusion at somehow shrouding the spark helps performance. And I think you'll find the days of having to gap plugs is long gone, except in rare situations and very old vehicles. The OEM Delco plugs, if that's what you go buy, will most likely be pre-gapped and state not to try to gap them at all.
I try to run NO Bosch if I can help it, well, maybe an oxygen sensor, in a pinch. But again, OEM is best....like with the oxygen sensors I just replaced this morning. Bought Denso because that's who the OEM was for those sensors on my truck and the Denso branded ones were a tad cheaper than AC Delco branded, which are Densos anyway, once you opened the box and looked at the sensor.
But I've used a ton of Bosch on my '95 Volvo as it was the OEM for a bunch of the stuff on the car...ignition, etc.
I don't always agree with Meghan54...but when I do...
...it's because Bosch plugs blow goats.
I can agree that running
factory Bosch plugs (not that quad cathode crap) in a car that came with them (Germans) is not a bad idea. But I generally say NGK or Denso > all else. Japanese spark plugs: They Just Work.
OP sounds like he just needs to clean the throttle. I've fixed cars that would barely idle, even die upon throttle application, by simply cleaning a moderately dirty electronic throttle. Use the [supposedly] electronic-safe cleaner, not carb clean. I can't say that I'm sure there's a difference, but when one $5 can will clean like ten throttles, I don't see any point in taking the possible risk.
I don't think Seafoam or similar does anything before the combustion chamber. Makes no sense to think that it does, IMO. I guess if you run enough of it, and it has a high enough detergent content, you could loosen up crap in the intake, including gunk around the injectors. But that's not really the same as clearing a 'clogged' injector...that's internal. And if it does do anything in the intake, it would take time.
Clean throttle and 'Italian tune-up' always works for me. An actual triggered relearn is rarely necessary. By that, I mean a throttle 'initialization', as typically triggered by a scan tool. Sometimes (early Nissan electronic throttles are all I can think of off-hand) a really convoluted sequence of key turns or some such can be used to trigger it without a scan tool. And to even
further clarify (sorry), 'scan tool' doesn't mean a generic OBD2 adapter for your phone/tablet/laptop. You have to go through the manufacturer-specific protocol.
...but like I said, it's rare that you will need that. Worth a google before you do it, though.