Sputtering when I give it gas while parked

Hi,I have 99 Chevy Blazer 4.3 with 217k I just had the intake gaskets put on and timing corrected on it my issue is the blazer is parked for now but when I turn it on it stays at idle but when I give it gas it sputters alot like it's got a fart stuck I just replaced iac and got a throttle position sensor at junkyard for now it turns on fine but that's it new o2 sensors put on last summer new spark plugs as well as distributor cap too i never had this issue ever can someone please let me know f anyone has had this problem I can take it to AutoZone to get scanned cause I don't want it to shut down on way there.

 

To make things clear:
- it was idling OK prior the intake gasket change?
- how did You set the distributor timing?

 

Yeah, I'm with Mike.

Sounds like something got messed up wirh the distributor.

You say you had the intake gaskets done. Did you do it, or take it to a shop?

 

I had a mechanic come and do it for 250$ he set it on time first time and it was perfect,then when it started sputtering being parked for like 8,9 yrs..he came back and messed with timing 2time and then he finally came back and set it rite where it started rite away.could it be starving for gas cause I'm at an incline with back to street.it has a new map sensor.couls it be maybe throttle sensor?

 

Parked for 8 or 9 years ? If so start out with draining old fuel and replace the fuel filter

 

Yeah, 8-9 years is a rediculously long time to let a vehicle sit

 

Well I took it as a typo
If it isn't, then I'd suggest looking at the running engine's parameters to find out what is happening, for an accurate diagnosis. Do You have any codes thrown?