Toyota switched V6 engines on the Taco for fuel economy reasons, mainly CAFE shit and also because they sold a shitton of Tacos in places like Hawaii where gas is expensive. People were mainly buying 4Runners at that time as mallcrawlers and gas mileage wasn't as big a concern. Plus they axed the FJ Cruiser which only ever came with the 4.0L, in part because it was such a thirsty piglet.

There's a reason Toyota now only offers turbocharged, overworked, grenade-tier engines in all of their consumer vehicles. Do not give them money, buy old Toyotas with 4.0'
s and DO NOT take your vehicle to a dealership for any services. They will absolutely sabotage it so you buy a nu-Toyota.