Car Misses Under Boost

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96 gst , when the car is cold it runs fine once it warms up at about 4800 to redline it misses/sputters/hesitates not really sure which one it is ive had a couple different opinions.
i have a check engine light on its code p1105 , (fuel pressure solenoid) ive cleaned it with electrical cleaner its still the same. if i replace the fps would it fix my problem?. could the fps even cause this problem?
let the posts begin, all help is much appreciated
also i forgot to mention this it only does this under high boost, driving normal its fine runs great.

 

[4BangR-x]

Well its iffy, but how old are your plugs/wires?

 

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not sure, i just bought the car 4 days ago, its had 2 owners before me 1st was a lady meticolous rich girl i swear to god she has every single receipt up until 04 when she sold it
(i have two binders full of receipts and every one was from the dealer) seeing how everyone was from the dealer i figure they ripped her off and told her it need new plugs and wires so lets say they were last changed in 04. possibly the guy i got it from could of changed them but i doubt it, maybe though, because he was really meticolous about all the oil changes i have lots of receipts from that too. but i couldnt find any plugs or wire receipts, ill look again

 

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it only happens when it warms up though i just took it to the gas station and back and it was fine. if it only happen when its hot the i dont believe it could be plugs and wires. also when i first got the car i put some shitty gas in it. i just put some shell v power in it.
i doubt if it could be the gas though

 

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it doesnt hesitate all the way up to redline it stops i think around 6100

 

[SeeYaAWD]

I would try a boost leak test. What mods do you have?

 

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no mods at all , yea i was kinda thinkin that maybe theres a line that expands when it gets hot and leaks

 

[blackGSX2g]

Yes, check for boost leaks and buy some NGK BPR6ES spark plugs; they are about $1.50 each.

If that doesn't solve your problem, come back and we'll help you further.

Also, the FPR solenoid only affects start-ups, it would have no affect on WOT. Most people don't run theirs at all.

 

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i just put some new plugs in it and the car runs great pulls strong with no hesitation at all.
thanks alot.
its weird though because it would only do it when it warmed up and i didnt think plugs could cause that.