I washed my 93' 4.9 engine immediately he hesitated on me like a serious bogg. Stopped I pulled in finished drying car started right up went to mash gas bogg. Has been doing for two weeks
Replaced inline fuel filter peeled rubber strong again, then went to mash gas bogg.
Put vpower rather than Chevron techron ran real nice till I put techron and injector cleaner..
Ran out put vpower back in strong for 6-7 miles went to test theory on Gas.....mash gas bogg...running rough under ten gallon put 10$ vpower in did better but could feel performance no where near usual peel rubber self. Took for drive turned car of went to turn on click click click....changed starter started right up drove came down a steep hill got to stop light lights on dash stalls out... Tried to start .. like starter was dragging... Got jump boom checked battery with tester charging......got on freeway could feel hesitation got off pulled to park turned key off had to jump again. Left Alone for a few hour came out started right up drove very carefully in freeway bout 6 miles could feel hesitation but stayed on turned off sounded like needed jump went inside approx 2 hours came out started now I'm writing sitting parked.

 

New distributor? If while you washed engine water got in distributor you would various performance troubles. Poor grounds and / connections. Check fuel pressure. Invest in Factory Service Manual