Check the hose clips for tightness and inspect the trunking for any cracks or splits and moreover all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best mannerism to locate a leak is to have the engine running and warm and next spray lighter gas /propane or brake cleaner concerning each joint in turn. If the engine rev s taking place you ve found your leak.
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will every result in insufficient fuel visceral delivered to the engine. Might then be worth cleaning out the idle zeal control motor / valve as these get clogged occurring in imitation of carbon and some brake cleaner washed through helps release things off.
Hello the TPS does have an effect upon switching the car into idle mode in view of that I'd suggest to create certain the throttle dish is 100% closed and not slightly high and dry afterward carbon. and next adjust the TPS correspondingly that the IDL glue is continuous to the E2 attach following the throttle is closed, and get into circuit later than the throttle is just cracked. Don't upset about any voltages, the IDL approach is the essentially important one.