Yes just takes small leak ...not a perfect spray from injector...then the idle "Tumbles" / shakes "...sometimes clears, but dont go out and purchase new till you have tested, unless your OK on getting new, will run through the Test...all 4 injectors must be removed with there pipes connected, bit of a job...but can be done, wipe all 4 "nossels" perfectly dry and clean, unplug the Fuel pump relay, you will see the numbers 30 Red wire and 87Red/Black ONLY in the relay holder, you need to bridge these 2 terminals with a short piece of wire, no need for Ignition on, as soon as you bridge the fuel pump will run, there will be some pressure at injectors 30psi but these injectors dont start to open till 45psi...... , carefully look at all 4 injectors, there must be no Fuel leaking / oozing from injectors, there is a small valve in these injectors, any leaking are U/S....thats the test....on the 5th cold start injector same test, has to be removed with its pipe....pump running...no leaking...now this pipe has Full pressure at it 80/90psi , so extream care hear...again no leak should be seen, very very rare back in the day that injector gave trouble...but again should be tested. thats the Test, hope of help. Dont get 87 / 30 wrong in the relay socket or damage will result. these injectors cannot be repaired, they dont like lead-free petrol....so Fuel injector cleaner in tank helps a lot. Peter