My 87 4Runner recently overheated and blew a head gasket. Me and a good friend took everything apart and replaced the head gasket. After putting everything back together I noticed that the truck was missing at idle, but seemed fine when it was at higher RPM's. I took it for a drive and noticed that once it got up to temp applying the brakes would cause the engine to surge in cycles and the tempurature would climb. If you took your foot off of the brake the surging would stop and the engine temp would come back down. I suspected that some of the problems might be the original seals on the fuel injectors (suspecting a leak), so I replaced the seals and tried again. This time the idle was good and the surging went away, I thought the problems were fixed, but they reappeared the next time I started my truck.
I would like to continue driving my truck but this makes me question how stable she would be on a long commute. Any ideas on where to look next (I have also replaced the vacuum tubing)? This motor was a complete rebuild a few years ago with less than 10000 new miles on it before the head gasket failure. Any ideas or Mechanic recomendations (Riverside/San Bernardino areas) would be appreciated.
Thanks,
-Mark