I had this problem back in the '80's with my first Firebird. I went through three or four solenoids in a month. I had been purchasing them from my 'local' auto parts store. I finally bought one from a GM dealer, and presto --- worked for years until I sold the car.
I went back to the 'local' store and watched their eyes glaze over as I described what happened. They wouldn't do a thing, so I never bought anything from them again. (must have been cheap import crap) The thing is that they all looked IDENTICAL, even the GM one. (other than the GM box) So I don't know if I got lucky, or there was something to it.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold