misses at running temperature

[scott83]

88 ranger 2.9 the engine doesnt have as much power as it should.. when you drive it about half hour it will backfire through motor not a bad backfire though, mostly when you run through the gears quickly .. can tell motor has a miss to it, because it has a shake to it when running..

[scott83]

for more information, new spark plugs, wires, ignition module on distributor, new distributor cap and rotor.. could it be the injectors?

[scott83]

and it has poor throttle repsonse and when it gets over 3000 rpms it wants to idle back down when your still giving it alot of throttle