Joe Montana had the most passing touchdowns by a quarterback in a game in 1990, with 6 touchdowns against the Falcons on October 14, 1990.

what is the most passing touchdowns by an nfl quarterback in a game in the 1990 season
Interpreted as:
What is the most passing touchdowns by an NFL quarterback in a regular-season game in the 1990 season?
10/14/1990Montana11/18/1990Moon10/14/1990Moon12/23/1990Brister12/22/1990Schroeder12/16/1990Peete12/2/1990Everett11/18/1990Rypien11/11/1990Kelly11/4/1990Cunningham10/29/1990Brister10/21/1990Kelly10/14/1990Brister9/16/1990Everett9/9/1990Moon12/30/1990Carlson12/29/1990Cunningham12/29/1990Rosenbach12/23/1990Rosenbach12/22/1990George12/16/1990Moon12/16/1990Schroeder12/10/1990Schroeder65544444444444433333333
NAMEDATETMOPPTDCMPATTPCTYDSAVGTD%INTINT%SCKSCKYRATE
Joe MontanaJoe Montana10/14/1990SFSF@ATLATL6324965.34769.712.224.1434119.6
Warren MoonWarren Moon11/18/1990HOUHOU@CLECLE5243275.032210.115.600.0538146.1
Warren MoonWarren Moon10/14/1990HOUHOUvsCINCIN5213363.636911.215.213.000128.7
Bubby BristerBubby Brister12/23/1990PITPITvsCLECLE4101952.61397.321.100.0119116.0
Jay SchroederJay Schroeder12/22/1990RAIRAI@MINMIN4101566.723415.626.700.000149.3
Rodney PeeteRodney Peete12/16/1990DETDETvsCHICHI4182766.731611.714.827.416115.1
Jim EverettJim Everett12/2/1990RAMRAM@CLECLE4222975.92619.013.800.010142.4
Mark RypienMark Rypien11/18/1990WASWASvsNONO4263868.43118.210.500.000128.3
Jim KellyJim Kelly11/11/1990BUFBUFvsPHXPHX4111668.816510.325.016.3111115.9
Randall CunninghamRandall Cunningham11/4/1990PHIPHIvsNENE4152462.524010.016.700.0330135.4
Bubby BristerBubby Brister10/29/1990PITPITvsRAMRAM4152462.51616.716.714.215104.3
Jim KellyJim Kelly10/21/1990BUFBUFvsNYJNYJ4193259.42979.312.513.1221116.8
Bubby BristerBubby Brister10/14/1990PITPIT@DENDEN4212875.035312.614.300.0110156.3
Jim EverettJim Everett9/16/1990RAMRAM@TBTB4182572.026910.816.000.0216146.5
Warren MoonWarren Moon9/9/1990HOUHOU@ATLATL4315259.63977.67.723.82893.2
Cody CarlsonCody Carlson12/30/1990HOUHOUvsPITPIT3222975.92478.510.313.4315120.9
Randall CunninghamRandall Cunningham12/29/1990PHIPHI@PHXPHX3131968.41729.115.815.300114.5
Timm RosenbachTimm Rosenbach12/29/1990PHXPHXvsPHIPHI3193161.33019.79.713.2537112.4
Timm RosenbachTimm Rosenbach12/23/1990PHXPHXvsNYGNYG3234156.13819.37.324.931391.6
Jeff GeorgeJeff George12/22/1990INDINDvsWASWAS3183354.52527.69.100.0436109.7
Warren MoonWarren Moon12/16/1990HOUHOU@KCKC3274560.052711.76.700.0322123.1
Jay SchroederJay Schroeder12/16/1990RAIRAIvsCINCIN3102050.01638.215.000.000117.3
Jay SchroederJay Schroeder12/10/1990RAIRAI@DETDET3121963.219510.315.8210.52997.5
Steve DeBergSteve DeBerg12/9/1990KCKCvsDENDEN3182766.72549.411.100.000133.9
Randall CunninghamRandall Cunningham12/2/1990PHIPHI@BUFBUF3152560.02319.212.014.0650113.5

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