fuel injection

[BTW]

Im trying to get my 89 GrandAm running right.It has a dead spot right of of idle.It wants to stall.Once I get past that spot it runs just fine.When I have it idling in the garage I step on it hard it backfires stalls a little and then runs fine.The engine is a guad 4 I replaced the throttle posisition senser with no luck.Does anybody have any ideas what could be wrong?
Thanks Brett

[intimida]

is the check engine lamp on? if it is unplug the tps and pull on the wires on the plug they were known for broken wires at the tps connector

[BTW]

The check engine light is not on and the wires seem to be fine.

[daman]

Have you ever changed the fuel filter, sounds like a fuel delivery prob.

[BTW]

yes new filter new pump

[BTW]

come on guys give me some more ideas i give up.

[intimida]

does it idle smooth? if not they are known for bad coil housings you can try replacing it. that's if it has a misfire you'r next step would be to check the fuel pressure. it could be a faulty fuel pressure regulator.

[BTW]

It idles smooth just has a dead spot and backfire when you step on it then runs fine.

[intimida]

sounds like a lean misfire too much involved to diagnose over the net.recheck your fuel pressure when it acts up look at the gauge see if it's dropping too much could be a new defective pump.